Round 1: Vegito, base Goku in GT was said to be as powerful as Super Saiyan 3 DBZ Goku and Full power Super Saiyan 3 DBZ Goku = Base Vegito and I don't see bade Vegeta being as powerful as Super Saiyan 3 DBZ Goku.
Round 2: Super Saiyan 4 Vegeta. Super Saiyan 4 Vegeta = Super Saiyan God Vegeta and Super Saiyan God Vegeta > Super Vegito.
Vegeta was kind of a beast in GT when he soloed Baby Goten and Baby Gohan after being ambushed. Honestly don’t see why Vegeta couldn’t replicate his past fusion’s big feat of toying with Boohan. Boohan isn’t that much stronger than Baby Gohan and Goten.
There is also no reason to believe that base Vegeta and base Goku weren’t still equal as that is the status quo and nobody ever said that things changed.