A x1.33 gap. It’s implied to be smaller than #19 VS Vegeta or Semi Perfect Cell VS Vegeta, but larger than Initial Imperfect Cell VS Piccolo or #20 VS Piccolo.
Yeah I like to view the Buuhan and Vegetto fight as closer to SSJ2 Gohan VS FP Cell than FP Semi Perfect Cell VS Super Vegeta. The former I view as a 66%-70% gap while the latter is more of a 60%-66% gap.