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Don't understand why this is a mind twister?
Because using the same shortcut as on the other device would be suggesting itself / choosing a different is unneccessarily complicating things?
salad-
It's not that another has been chosen, it's that there isn't one to correspond to cmd+enter at all. That cmd+enter opens a new tab at /create to me suggests that it's doing its best guess at the 'cmd+click' functionality of opening a new window as user intention, replicating an established desktop behaviour and which doesn't seem wholly unreasonable. The amount of iPad apps that support any keyboard shortcuts is shockingly low (looking at you Google (of which, almost everything they spew out for iOS is incredibly platform hostile)), and the number of shortcuts inside non-first-party apps that actually do support them is also minimal. Even simple tabbing is largely broken. Safari is better than most, but who knows if it'll ever get to desktop OS shortcut parity.
6pt
Don't understand why this is a mind twister? two different devices running two different OSs, one that's always existed with a keyboard and one that's still untangling integrating an always-on (instead of contextually appearing) keyboard (and a pointer) into it at a system level.