Is 2 pinkies equivalent to a fuzzy?

[D70challenger]

Hey guys,
My king snake easily shoves down 2 2gram pinkies. but cant get down a 5gram fuzzy, almost, but just a tad too big. Should I just keep feeding him (2) 2gram pinkies, or should I look for a single 4gram? If the weight is the same, does it matter if he eats 2 or 1 item? I heard it is better to eat a larger single than 2 smaller.

Reason I am bothering asking is because all my local stores only carry 2g pinkies and 5g fuzzies, and if I need something in between, I will have to order from the internet.