Not to be pedantic, but the floater is A6M2
-N. Nakajima also provided a second line for conventional Zekes, too... so it IS kind of a big-deal difference.
Refresher on IJN designation systems:
A - first letter - design mission (A=fighter)
6 - first number - round of designs for that mission (A6 = 6th round of fighter designs)
M - second letter - designing firm (M = Mitsubishi)
2 - second number - major revision of basic design (2nd major version)
-
N - suffix - aircraft adapted from one mission to another, same as first-letter code for that mission (N=seaplane fighter; the N1K4-A prototype went through the same process in reverse to turn a floatplane design into a carrier fighter)
Anyway, hope this helps.
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