[X4]

Is it possible to replace the FN and CTRL key on a Macbook?

It would drive me nuts having it in the wrong order.

[cunninghamd]

Honestly, just use the CAPSLOCK key as a CTRL key.

1) it's more comfortable.

2) Now, the place of the FN key doesn't matter anymore! :)

[almostdvs]

You don't really use either of those keys on OS X.