There wasn't a direct statement. I calculated their multipliers when I compared the two to Baby Vegeta and found that they were about the same distance from Goku's base forms.
(Buu arc) Base Goku
Ssj 3 Buu Arc Goku= (GT) Base Goku
Ssj 3 (GT) Goku< Ssj Baby Vegeta
Ssj Baby Vegeta<= Super Vegito
Super Vegito> 160,000× (Buu arc) Base Goku
Super Baby 1= 2× Ssj Baby Vegeta
Super Baby 2 (4× Super Baby 1)= GO Goku
Golden Oozaru Goku> 3,200× (GT) Base Goku
GO Baby Vegeta/Ssj 4 Goku= 10× Super Baby 2