The base stock is similar, but environmental factors, press lines, and coatings can vary, so you get small differences in how cards feel and how the art and ink look
But you can very much kill one of the three creatures in the coven, or mess with their power so that they arent different
If you're grading cards for maximum resale value or long-term investment, PSA is generally where the market points
Want to get cheeky
Ghalta, Stampede Tyrant It wouldnt be an Ixalan set without Dinosaurs, now would it
Ob Nixilis, the Hate-Twisted fits this list better but should be treated more like a 5-mana removal spell with upside, or a more costly Underworld Dreams that is a different type of permanent