Topic: I was wondering if anyone could tell me what the 'Art Nr' on the backs of Switch and 3DS game cases refer to?

Hi.
I was wondering if anyone could tell me what the 'Art Nr' on the backs of Switch and 3DS game cases refer to?

I ask because I've noticed Ultimate alliance 3 for Switch, seems to have two different numbers and am wondering if they signify any difference in the game artwork or the game cartridge inside.

I refer to E.U copies of game, as I am from the U.K