An N1 box is just a 16ve box there is no difference. Only the Nismo boxes have different gears.
A box with a 4.3fd originally has better gear ratios suited to being used with an aftermarket FD be it a 4.7 or 5.1.
A box with a 4.3fd originally has better gear ratios suited to being used with an aftermarket FD be it a 4.7 or 5.1.