Yes, 'B' looks like someone actually drew it. Compared to 'A' which doesn't quite look like a photo or 3D model - it's hard to put any descriptor on that other than "AI".
Uncanny Valley. The gap between cute unrealistic and realistic. That is the vibes it gives to me - in addition to being obviously generative ai content given the context. It probly is almost the same prompt with minor style adjustment.