Map size - edit existing unit or create custom?

Quite simple Q - which takes the most size - creating a whole new, custom unit or editing a existing (editing in so that it is pretty much completely different)?

You don't have to worry any about this.

Both are the same size (and at that, incredibly tiny).
It's basicly a binary file, and when you do any changes to some units, it just writes down the original unit in the file, and then lists all "changes" you did to it. Same with custom units (as you always base custom units of original units, remember).

And ofcourse you can make custom units much more organized.

Cubasis

Thx for the reply! I guessed that they're pretty tine, but, ah, never hurts to ask... :D

Thanks again!