EXCLUSIVE

Same last name … but NO love between Logan Paul and “Breaking Bad” star Aaron Paul — with Logan telling TMZ Sports he would beat Aaron’s ass if they ever came face-to-face. 

Their beef goes back a few months … when Aaron trashed Logan for his video stunt gone wrong in the suicide forest in Japan. Aaron told Logan to “go rot in hell.”

Now, Logan is firing back … calling Aaron an “Internet bully” — and warning the actor that if he REALLY wants a piece, he’ll end up getting hurt. 

Of course, Logan is training for a real boxing match against video game/YouTube superstar KSI next month in England … and Logan tells us it’s going to be one of the biggest pop culture events of the year.