Both Ellen!

Mane-iac the Pony (from My Little Pony: Friendship is Magic) is voiced Ellen Kennedy, the same woman who voices Mrs. Pteranodon the Pteranodon longiceps (from Dinosaur Train).

While Mane-iac is an evil comic book villain, Mrs. Pteranodon is a friendly and welcoming mother/stepmother (since she has three of her own children and a 4th one being adopted).

Ellen has only appeared on FIM in the episode "Power Ponies". On DT, however, Mrs. Pteranodon is a main character (Ellen has also done a few minor roles on DT as well).

Ellen, if you see this, I just want to say that you've got great talent.

NOTE: I gave Mrs. Pteranodon a slightly different appearance to make her look more like an actual female Pteranodon.

PS: This pic was partly done by request someone gave me. I hesitated beforehand. The reason why I hesitated shortly was because I'm now a former brony.

MLP (c) Hasbro

FIM (c)

Dinosaur Train (c) Craig Bartlett/Jim Henson Company/PBSKids