I mean, just the longer hair (some months passed and he obviously grew it out some) and the wind blowing it back make quite a difference. Both him and Reiner are SUPPOSED to look a bit different there.
That's not to say that AoT S3 doesn't have a fair amount of inconsistent character art and the last episode with it's way too many key animators and animation directors was no different.
A fucking shame this stupid industry and its ridiculous production committees, scheduling and pretty much guaranteed extreme crunch. One would hope WIT would actually be given the time to produce AoT properly but nah... Worst thing is, while the 2nd half right now wouldn't have been possible at all, it'll probably face similar production issues yet again in April.