At idle or on the first progression hole 45F9 may be a lot like 50F8 but 50F8 will supply more air/fuel emulsion at the top of the progression range and that will influence the transition.
76 Suzuki GT500
2011 Jaguar XKR
A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke