Whats the difference ? 4150 question !

A body said
My Braswell 4825 is a 1.48 venturi 1.79 throttle blade..... swapped intakes so I’m running a 4500 now. Went some 9.4s with the Braswell.

So the 4825 is a 4150. That’s what I thought. At this point I think a Dominator with a tapered spacer isn’t as bad as I thought it was.