I think you're splitting hairs there. The definition of a wing-back is pretty much an attacking full-back.
There's similarities and differences. For example the game we all saw Allayhar play wing back was in a game we played a back 3 so notably he had cover from the left sided CB. Wing back's normally dont get deployed as much in a back 4 as they're a lot more aggressive as they're more often than not the teams focal point of width attacking wise on that wing.
Now we are playing a back 4 we play with Full backs be it attacking or defending. Allayhar would be found out especially playing that deep
