The fighting game could be a spin-off!
And we could give it a Latin sounding name that may or may not have any relevance to the game!
Then we could make a sequel to it, adding a load of characters that fill the exact same roles as previous characters with very minor gameplay differences!
This is pure genius; I should write this down...
Seriously though; I'm cool with working on both.
RPG battle sprites and fighting game sprites would end up being the same for the most part anyway, with the exception of regular punches and kicks added for the fighting game.
It's all up to the coders...