Don't ever attempt to upload credit cards whose numbers match.

components/autofill/core/browser/credit_card.cc

Index: components/autofill/core/browser/credit_card.cc
diff --git a/components/autofill/core/browser/credit_card.cc b/components/autofill/core/browser/credit_card.cc
index 9083b4035b18829a2ae6e12c398c69b8ebce2c8b..6c92cccee5cad1b4a68a730d81beb0b0f20b833f 100644
--- a/components/autofill/core/browser/credit_card.cc
+++ b/components/autofill/core/browser/credit_card.cc
@@ -598,11 +598,17 @@ bool CreditCard::IsLocalDuplicateOfServerCard(const CreditCard& other) const {
   if (number_.empty())
     return true;
 
-  if (other.record_type() == FULL_SERVER_CARD)
-    return StripSeparators(number_) == StripSeparators(other.number_);
+  return HasSameNumberAs(other);
+}
 
+bool CreditCard::HasSameNumberAs(const CreditCard& other) const {
   // For masked cards, this is the best we can do to compare card numbers.
-  return TypeAndLastFourDigits() == other.TypeAndLastFourDigits();
+  if (record_type() == MASKED_SERVER_CARD ||
+      other.record_type() == MASKED_SERVER_CARD) {
+    return TypeAndLastFourDigits() == other.TypeAndLastFourDigits();
+  }
+
+  return StripSeparators(number_) == StripSeparators(other.number_);
 }
 
 bool CreditCard::operator==(const CreditCard& credit_card) const {