Should be no problem running a 12s crank on an 11s bike; worst case scenario you have to shim to get the right gap, but that's unlikely.
was more concerned about the 11sp chain on a 12sp ring but according to various people (incl. youtube) it seems fine
All chains from 9 speed to 12 speed have the same internal width of 2.18mm. For once YouTube is right.
@swedeee started
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Should be no problem running a 12s crank on an 11s bike; worst case scenario you have to shim to get the right gap, but that's unlikely.