According to people from GrapheneOS these are two different things:

To be clear, https://play.google.com/store/apps/details?id=com.google.android.apps.devicelock is not what’s included in GrapheneOS. There seems to be some confusion about that. This is the app that does what’s being described.

What you see in GrapheneOS is https://android.googlesource.com/platform/packages/modules/DeviceLock/+/b1a971a6e29f5b426b13d96d7692e9dd5a7e81e2/DeviceLockController/

https://discuss.grapheneos.org/d/11639-device-lock-controller/9