I haven’t tried this in macOS 26 yet (which firmly remains a testing volume for now), but I’ve found that the old Get Info trick, where you click on the icon you want to use at the top, hit ⌘C to copy it, and then paste it into the Get Info panel for the thing you want to use that icon for, works better than other methods these days. It used to be that swapping out the .icns file was the proper way, or at least it worked better than the Get Info trick (whether it was proper proper I don’t know), but lately changing the .icns file trips the “damaged” flag on launch, and doesn’t seem to work well anyway, once you bypass the warning.
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