Theyre both best friend

Mafia Wally is a mafia

Vaquero Wally is a Vaquero

Theyre from different universes but they met at a place called 'Wallyverse' where all the Wally's get teleported.. They just met for a day and boom! Best friends already.. They found a portal to the way here they thought it would bring them to their universes but nope just here-

A Mafia and A Vaquero!

Opposite Wally is short tempered and rude

While Wally is friendly yet often mad and is annoying to Opposite Wally

Wally always haves a smile on his face so its hard to tell what his expression is

Opposite is always mad

Wally is obsessive while Opposite Wally is overprotective

Opposite Wally likes plums while Wally likes apples

Two complete opposites

RF Wally is a scientist that is the owner of a factory called 'Rainbow Factory'

Opposite is rude, mean, and short-tempered