Power and setup will make a difference in MPH
For example if we have 2 cars with 450awkw, one with -5's and a dog box and one with a Gt42 and standard gearbox with a clutch that won't shift at high rpm the car with the -5 will trap higher obviously.
The guys with the 500kw dyno graphs trapping 125mph very well could have that power but might not have the tyres, clutch, gearbox, powerband, driver to use it properly.