there's more than that:
the top of the shoe is slightly off.
the sides of the shoes are also off.
and a little bit at the top of the lacing area... these things are very small, but if you check before and after with a shoe patch, you see the diferences (if you made the patch anyway

)
it seems like the shoes are a little of at every side... it doesn't take much work to convert them at all realy, it's just that you have to do it with every colorway, and that you have to check ingame every time so that they realy match...