The 472 and 475 both act about the same given the are 87 or 83 and .90.
The spoolup is very close.
The 75 takes more drive.
I went from a 75cw to a 72mm cw fmw model loosend up the housing and now it spools the same as the 75 but performance and egts/ pressures are better.
The top end power...