How does changing code Per modual effect macros

[Mellowmark]

I would like to know how difficult changing around the module codes will be with respect to macros.  I have set up someting like
O10 Porch light
O5 rear light
and some macros to turn them on and off.

Now I am not sure if those codes will stay on each device.   I Might want to change O5 rear light to O11 or vice verse to make the remote able to controll them individually.  That will cause a problem with the macro, or will the program track witch one i change and do it to the macros.   Do I have to redo every thing..   If so you really have to plan this stuff out.   I know that's where the fun is.