Adagio
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Adagio, you don't understand...
They actually look more alike than any two human units.
Not only do they look different, but their concept and functions on the battlefield are also different. In short, it's pointless to explain. The best way is to go here and read everything for yourself. And regarding the visual similarity, I repeat: the units are different! Just because the models are made in the same color scheme doesn't mean that the creatures are identical. Don't talk nonsense, wait for the game to be released, and then you can really talk about something.
And, yes...
Spring Spirit / Snow Maiden
Sentinel / Crossbowman
In the first pair, and in the second, the units are completely different. Well, if the first pair looks alike, as you claim, then the second pair has no less similarity.