diff --git a/packages/pyright-internal/src/analyzer/constraintTracker.ts b/packages/pyright-internal/src/analyzer/constraintTracker.ts
index a0b2bd9b8b27..cb77fc493150 100644
--- a/packages/pyright-internal/src/analyzer/constraintTracker.ts
+++ b/packages/pyright-internal/src/analyzer/constraintTracker.ts
@@ -78,7 +78,7 @@ export class ConstraintSet {
                 return type1 === type2;
             }
 
-            return isTypeSame(type1, type2);
+            return isTypeSame(type1, type2, { honorIsTypeArgExplicit: true, honorTypeForm: true });
         }
 
         let isSame = true;
diff --git a/packages/pyright-internal/src/analyzer/protocols.ts b/packages/pyright-internal/src/analyzer/protocols.ts
index 4aca93317de7..7518a15b0d6e 100644
--- a/packages/pyright-internal/src/analyzer/protocols.ts
+++ b/packages/pyright-internal/src/analyzer/protocols.ts
@@ -257,8 +257,8 @@ function getProtocolCompatibility(
         }
 
         if (
-            isTypeSame(entry.destType, destType) &&
-            isTypeSame(entry.srcType, srcType) &&
+            isTypeSame(entry.destType, destType, { honorIsTypeArgExplicit: true, honorTypeForm: true }) &&
+            isTypeSame(entry.srcType, srcType, { honorIsTypeArgExplicit: true, honorTypeForm: true }) &&
             isConstraintTrackerSame(constraints, entry.preConstraints)
         ) {
             return entry;
diff --git a/packages/pyright-internal/src/analyzer/types.ts b/packages/pyright-internal/src/analyzer/types.ts
index 099eab62cb41..535f93e4bf74 100644
--- a/packages/pyright-internal/src/analyzer/types.ts
+++ b/packages/pyright-internal/src/analyzer/types.ts
@@ -119,6 +119,7 @@ export interface TypeSameOptions {
     ignoreConditions?: boolean;
     ignoreTypedDictNarrowEntries?: boolean;
     honorTypeForm?: boolean;
+    honorIsTypeArgExplicit?: boolean;
     treatAnySameAsUnknown?: boolean;
 }
 
@@ -3361,6 +3362,12 @@ export function isTypeSame(type1: Type, type2: Type, options: TypeSameOptions =
                 return false;
             }
 
+            // This test is required for the "partial" class, which clones
+            // the symbol table to add a custom __call__ method.
+            if (type1.shared.fields !== classType2.shared.fields) {
+                return false;
+            }
+
             if (!type1.priv.isUnpacked !== !classType2.priv.isUnpacked) {
                 return false;
             }
@@ -3369,6 +3376,12 @@ export function isTypeSame(type1: Type, type2: Type, options: TypeSameOptions =
                 return false;
             }
 
+            if (options.honorIsTypeArgExplicit) {
+                if (!!type1.priv.isTypeArgExplicit !== !!classType2.priv.isTypeArgExplicit) {
+                    return false;
+                }
+            }
+
             if (!options.ignoreTypedDictNarrowEntries && !ClassType.isTypedDictNarrowedEntriesSame(type1, classType2)) {
                 return false;
             }
@@ -3502,6 +3515,10 @@ export function isTypeSame(type1: Type, type2: Type, options: TypeSameOptions =
                 return false;
             }
 
+            if (type1.priv.nameWithScope !== type2TypeVar.priv.nameWithScope) {
+                return false;
+            }
+
             // Handle the case where this is a generic recursive type alias. Make
             // sure that the type argument types match.
             if (type1.shared.recursiveAlias && type2TypeVar.shared.recursiveAlias) {