Can anyone confirm whether the Shimano RD-U4000 CUES 9-speed rear derailleur has any specific design features that would prevent it from being used with a CUES 10-speed shifter and cassette?

I understand that the rear cluster capacity differs (48T max for the U4000 vs. 50T for the 10-speed derailleur), but aside from that, is there anything else that would make this setup incompatible?