https://imgur.com/hXWm9uw
They have the same basic humanoid shape, yes.
Then Z Trolls have:
- Tusks
- Body Scale things
- Animalistic ears
- Only 3 fingers
- Only 2 toes (sorry, matched it up with the others, but you know this)
- Vestigial toenail on heel (sorry)
- Extended and rounded noses (in comparison)
- Smaller and less luminescent eyes
- Literally green skin
That’s what makes them a different race. Compared to “one has darker skin and a their ear tilts the other way”