From a yoke perspective, they are mechanically similar, except the offset. As long as the forks fit in the yokes - 54mm bottom yoke and 50mm top yoke (if I remember correctly), you should be fine.
As for the forks themselves, using 4XV / 5JJ forks, you can use the original Fazer axle, wheel & brakes.
With 5PW forks, you’ll need the 5PW front axle, but the original wheels & brakes can be used.
With later model forks, (5VY onwards) you’ll need the complete axle, wheel and brakes, and master cylinder (?). Because of radial type brakes and different size brake rotors
The various forks have different lengths, all of which are shorter than the original fazer (588mm). So its always going to be lower at the front, no matter which forks you use – just a question of how much lower.
5XV & 5JJ are about 544mm. I think they are the longest of the R1 options.
5PW & 5VY are about 520mm.
My collection of info may not all be correct, so happy if someone could confirm.