In the anime, the appearances of Fossilized Drake and Fish are swapped, making them match the Pokémon they are supposed to restore.
In Pokémon Sword and Shield, the Fossilized Fish and Fossilized Drake appear to have mistakenly swapped sprites. The Fossilized Fish offers the "-vish" head for Dracovish and Arctovish but visually looks like the body provided by the Fossilized Drake. In the anime, their appearances are the opposite of their game sprites.
The Pokémon revived from the Fossilized Fish have 10 extra points in their Defense and Special Defense Stats, and 10 fewer points in their Attack and Special Attack stats, compared to their counterparts revived from the Fossilized Bird.