Version in base suite: 6.1.38+1
Version in overlay suite: 6.1.38+4

Base version: linux-signed-arm64_6.1.38+4
Target version: linux-signed-arm64_6.1.52+1
Base files: linux-signed-arm64_6.1.38+4.dsc
Target files: linux-signed-arm64_6.1.52+1.dsc

-E: version-substvar-for-external-package linux-headers-arm64 -> linux-headers-6.1.0-11-arm64
-E: version-substvar-for-external-package linux-headers-cloud-arm64 -> linux-headers-6.1.0-11-cloud-arm64
-E: version-substvar-for-external-package linux-headers-rt-arm64 -> linux-headers-6.1.0-11-rt-arm64
-W: odd-historical-debian-changelog-version 6.1.38-3 (for native)
+E: version-substvar-for-external-package linux-headers-arm64 -> linux-headers-6.1.0-12-arm64
+E: version-substvar-for-external-package linux-headers-cloud-arm64 -> linux-headers-6.1.0-12-cloud-arm64
+E: version-substvar-for-external-package linux-headers-rt-arm64 -> linux-headers-6.1.0-12-rt-arm64
+W: odd-historical-debian-changelog-version 6.1.38-4 (for native)