Sharing lot/sim after deleting swatches?

I don't know how to fit that into a title and still have that make sense... What I mean is, I've downloaded some walls and clothing that have BOATLOADS of swatches, a chunk of which I know I won't use, so sometimes I remove the swatches I don't want to save on file space. Now say I made a lot with a wall that I had edited in that way. If I wanted to share that lot with somebody, would they also have to have the edited version of the wall in order for it to appear correctly in their game, or would they be fine downloading and using the original? (I guess basically what I'm asking is, does any given swatch have an ID that sticks around even if the order the swatches are in changes?)