My analysis...
-Roshi implies that Himself~Match Level Goku
-It is implied FP Tien is close to those two powers. Roshi says he'd ''probably lose'' in an all out fight and Tien muses he might have an enjoyable
fight against Match Level Goku.
-Even though Goku treats Match Level/Battle Level as two different levels of power, i don't think they're too different powers. He goes from
slightly weaker to slightly stronger than his foe. It can be something like
Match Level Goku: 7
Tien: 7.5
FP Goku: 8
Fair enough? A visible power up for Goku, but not any really impressive change.