specification: add allow_similar flag to is_same_package_as

src/poetry/core/packages/specification.py

@@ -71,9 +71,15 @@ def source_subdirectory(self) -> str | None:
     def features(self) -> frozenset[str]:
         return self._features
 
-    def is_same_package_as(self, other: PackageSpecification) -> bool:
-        if other.complete_name != self.complete_name:
-            return False
+    def is_same_package_as(
+        self, other: PackageSpecification, *, allow_similar: bool = False
+    ) -> bool:
+        if allow_similar:
+            if other.name != self.name:
+                return False
+        else:
+            if other.complete_name != self.complete_name:
+                return False
 
         if self._source_type:
             if self._source_type != other.source_type:

tests/packages/test_specification.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+import pytest
+
+from poetry.core.packages.specification import PackageSpecification
+
+
+@pytest.mark.parametrize(
+    "spec1, spec2, expected_exact, expected_similar",
+    [
+        (PackageSpecification("a"), PackageSpecification("a"), True, True),
+        (PackageSpecification("a"), PackageSpecification("ab"), False, False),
+        (
+            PackageSpecification("a"),
+            PackageSpecification("a", features=["c"]),
+            False,
+            True,
+        ),
+    ],
+)
+def test_is_same_package_allow_similar(
+    spec1: PackageSpecification,
+    spec2: PackageSpecification,
+    expected_exact: bool,
+    expected_similar: bool,
+) -> None:
+    assert spec1.is_same_package_as(spec2) == expected_exact
+    assert spec1.is_same_package_as(spec2, allow_similar=True) == expected_similar