I was wondering if anybody can tell me what the difference(s) between an F4F-3 and F4F-4 cockpit would be?

I have an F4F-4 model kit, but the interior PE I have is for an F4F-3 and I don't know if the two are interchangeable...

Sorry, Jeremy, just saw your post. My quess is the cockpits would be similar since the -4 was just a -3 with wing folds and two extra 50 cal. guns. From pictures, the instrument layout seems the same except for a couple of changed instruments and an extra instrument panel handle due to upgrades or prilot preference.The earlier -3 and initial -4's should have yellow-green chromate interior colors (except for the black central instrument panel and some side instrument/ circuit breaker panels), unless the plane was overhauled, when other colors, like interior green, were used. The gunsight may be the same as the -3 unless upgraded, and two of the six red machine gun charging handles at the bottom of the cockpit will be missing from the -3.
Might want to compare instructions
@ http://www.eduard.com/store/out/media/fe150.pdf and
@ http://www.eduard.com/store/out/media/fe412.pdf
(though they are for different scales and manufacturers). Also, long searches on google may result in some pics. Sorry for the delay. Hope this helps, Jeremy. Good modeling, Dave