diff --git a/scripts/jyotishyamitra_adapter_probe.py b/scripts/jyotishyamitra_adapter_probe.py
index fe8c611d..f1c4de26 100644
--- a/scripts/jyotishyamitra_adapter_probe.py
+++ b/scripts/jyotishyamitra_adapter_probe.py
@@ -13,6 +13,8 @@ import zipfile
 from pathlib import Path
 from tempfile import TemporaryDirectory
 
+from scripts.xalen_oracle_comparison import RASHI
+
 
 VERSION = "1.4.0"
 COMMIT = "86f7eb610a66b06b3f0817d2c53355bec8b3bf8d"
@@ -197,6 +199,42 @@ def extract_varga_signs(raw: dict) -> dict:
     return out
 
 
+def extract_local_varga_signs(raw: dict) -> dict:
+    d1 = raw.get("planets") or {}
+    varga = raw.get("varga") or {}
+    surfaces = {"D1": d1, **varga}
+    return {
+        chart: {
+            planet: data["sign"]
+            for planet, data in planets.items()
+            if isinstance(data, dict) and isinstance(data.get("sign"), str) and data["sign"]
+        }
+        for chart, planets in surfaces.items()
+        if chart in {"D1", "D2", "D4", "D9", "D10"} and isinstance(planets, dict)
+    }
+
+
+def extract_xalen_varga_signs(raw: dict) -> dict:
+    varga = raw.get("varga") or {}
+    return {
+        chart: {
+            planet: RASHI.get(str(sign), str(sign))
+            for planet, sign in planets.items()
+            if isinstance(sign, str) and sign
+        }
+        for chart, planets in varga.items()
+        if chart in {"D1", "D2", "D4", "D9", "D10"} and isinstance(planets, dict)
+    }
+
+
+def build_varga_comparison(jyotishyamitra_raw: dict, local_raw: dict, xalen_raw: dict) -> dict:
+    return compare_with_existing_oracles(
+        extract_varga_signs(jyotishyamitra_raw),
+        extract_local_varga_signs(local_raw),
+        extract_xalen_varga_signs(xalen_raw.get("raw", xalen_raw)),
+    )
+
+
 def compare_with_existing_oracles(jyotishyamitra: dict, local: dict, xalen: dict) -> dict:
     rows = []
     counts = {"local": 0, "xalen": 0}
@@ -206,8 +244,8 @@ def compare_with_existing_oracles(jyotishyamitra: dict, local: dict, xalen: dict
         for field, value in fields.items():
             local_value = (local.get(section) or {}).get(field)
             xalen_value = (xalen.get(section) or {}).get(field)
-            local_match = value == local_value
-            xalen_match = value == xalen_value
+            local_match = local_value is not None and value == local_value
+            xalen_match = xalen_value is not None and value == xalen_value
             counts["local"] += int(local_match)
             counts["xalen"] += int(xalen_match)
             rows.append(
@@ -217,8 +255,8 @@ def compare_with_existing_oracles(jyotishyamitra: dict, local: dict, xalen: dict
                     "jyotishyamitra_value": value,
                     "local_value": local_value,
                     "xalen_value": xalen_value,
-                    "local_status": "match" if local_match else "mismatch",
-                    "xalen_status": "match" if xalen_match else "mismatch",
+                    "local_status": "not_comparable" if local_value is None else ("match" if local_match else "mismatch"),
+                    "xalen_status": "not_comparable" if xalen_value is None else ("match" if xalen_match else "mismatch"),
                 }
             )
     return {
diff --git a/tests/test_jyotishyamitra_adapter_probe.py b/tests/test_jyotishyamitra_adapter_probe.py
index 61f321af..177cfd0b 100644
--- a/tests/test_jyotishyamitra_adapter_probe.py
+++ b/tests/test_jyotishyamitra_adapter_probe.py
@@ -2,9 +2,12 @@ from pathlib import Path
 
 from scripts.jyotishyamitra_adapter_probe import (
     build_report,
+    build_varga_comparison,
     canonical_request,
     compare_with_existing_oracles,
+    extract_local_varga_signs,
     extract_varga_signs,
+    extract_xalen_varga_signs,
     normalize_raw,
     schema_fingerprint,
 )
@@ -107,3 +110,43 @@ def test_extract_varga_signs_keeps_only_supported_planet_signs() -> None:
         "D1": {"Sun": "Aquarius", "Rahu": "Sagittarius"},
         "D9": {"Moon": "Cancer"},
     }
+
+
+def test_existing_oracle_sign_adapters_share_the_same_surface() -> None:
+    local = {
+        "planets": {"Sun": {"sign": "Aquarius"}},
+        "varga": {"D9": {"Moon": {"sign": "Cancer"}}},
+    }
+    xalen = {"varga": {"D1": {"Sun": "Kumbha"}, "D9": {"Moon": "Karka"}}}
+
+    assert extract_local_varga_signs(local) == {
+        "D1": {"Sun": "Aquarius"},
+        "D9": {"Moon": "Cancer"},
+    }
+    assert extract_xalen_varga_signs(xalen) == {
+        "D1": {"Sun": "Aquarius"},
+        "D9": {"Moon": "Cancer"},
+    }
+
+
+def test_varga_comparison_never_promotes_the_new_oracle() -> None:
+    jyotishyamitra = {"D1": {"planets": {"Sun": {"sign": "Aquarius"}}}}
+    local = {"planets": {"Sun": {"sign": "Aquarius"}}}
+    xalen = {"varga": {"D1": {"Sun": "Kumbha"}}}
+
+    comparison = build_varga_comparison(jyotishyamitra, local, xalen)
+
+    assert comparison["row_count"] == 1
+    assert comparison["match_counts"] == {"local": 1, "xalen": 1}
+    assert comparison["promotion_allowed"] is False
+
+
+def test_varga_comparison_marks_missing_engine_fields_not_comparable() -> None:
+    comparison = compare_with_existing_oracles(
+        {"D1": {"Rahu": "Leo"}},
+        {"D1": {"Rahu": "Leo"}},
+        {"D1": {}},
+    )
+
+    assert comparison["rows"][0]["local_status"] == "match"
+    assert comparison["rows"][0]["xalen_status"] == "not_comparable"