Always suspected GRX is literally Shimano R8000/7000 with some cosmetic changes.
They describe in quite a lot of detail how it isn't, at least internally, plus if you own both, like I do, you will notice they are very different in shape, hence my earlier post about me doubting compatibility.
@hippy started
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Always suspected GRX is literally Shimano R8000/7000 with some cosmetic changes.