A little modification of More Mob Variants by nyuppo that completely disables the hostile mob variants, making it compatible with other mods or resourcepacks that modify hostile mob textures or behaviour.
When used with Mobs Refreshed:

More Mob Variants description:
Recent mobs that have been added to the game all have plenty of fun variants to look at, but what about the old ones?
This mod adds new variants to the older mobs that all look the same, to make them a little more fresh.
Variants are added through NBT, meaning that they will be persistent across all players.
All variants and features are data-driven, allowing for full customization through datapacks.
In addition to the default texture, the mod currently features the following new variants:
Cat:
Chicken
Cow:
Pig (all variants can be muddy):
Sheep (all variants can have horns):
Wolf: