Evidence:

Ifrit, Odin, Shiva, Ramuh, Ravana, Bismarck, Leviathan, Titan, Bahamut, Nidhogg/Estinien, Sophia, Sephirot, Zurvan, Lakshmi, Moggle Mog, Susano, Tsukuyomi, Byakko, Seiryu, Suzaku, Hades, Titania, Innocence, the Weapons, WoL, Hydaelyn, Zodiark, Endsinger, Barbie and Rubicante DON'T share the same animations.

Why? Because they are all different characters.

Only Thordan and Golbez share animations. They didn't just copy one of the most iconic trial bosses' rigs for another important story trial. That wouldn't make sense, they might do this for side content. But for the MSQ?

No, Thordan and Golbez are the same character.