What I wouldn't give for a new Heroes of Might and Magic game with the pixel art style of HOMM2 and the gameplay mechanics of HOMM3...
Not exactly what you asked for but https://store.steampowered.com/app/867210/Songs_of_Conquest/ is somewhat close.
I played the campaign and it scratched the itch
Aren't there mods out there for HOMM3 to make it look like HOMM2?
edit: found one called "The Succession Wars"
https://heroes3wog.net/the-succession-wars/