They have been masters of second sourcing things for a long time! One can ony imagine the complexity of the Intel cross licensing deals.
This was the CPU architecure that saved AMD in the 2010's, see also: Video "How AMD went from nearly Bankrupt to Booming by Brandon Yen (2021)"
Each microarchitecture appears to fully specify all core parameters, it feels likely that they just reuse most of all of the RTL, or even pre-synthesize core blobs.
Bibliography:
Mentioned e.g. at: videocardz.com/newz/amd-begins-rdna3-gfx11-graphics-architecture-enablement-for-llvm-project as being part of RDNA 3.
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