I cant say 100% about Deore/GRX but they look like they use they use the same left crank arm clamp. Ultegra and Dura Ace certainly do. Back in 2018 I had just bought a Avio powermeter for my left ultegra crank arm, when I got offered 2nd hand dura ace for a while I ran the ultegra left crank on the dura ace chainset.
HLaB
7
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