looking for the t3 vs t3/t4 dyno chart

i’m now running a t3 .42/48 turbo and i wanna know the impact a bigger turbo would yeild. IMO Hp’s with 8 psi T3 = Hp’s with 8 psi T3/T4, the only changes would be in the powerband (T3 spooling faster). I know its been discussed with a CHART making the comparison between the two, but couldnt find it. anyone ?