Quote from Smops:
The first 3 suits (fusion, varia and gravity) are all rather the same, but with some extra effects. They look exactly the same, except for colors, as starman pointed out. The last suit you get really does look different, atleast ingame. So I guess it's the original suit, before the operation, with some slight modification thanks to the X infection, the metroid vaccine, and the fact that she doesn't have the same body-suit anymore (since the surgury altered it.)
This is the suit at the end it is exactly like every other Fusion suit except it has different collars.