Unfortunately, it seems all the logos on riocar.org are Windows bitmaps rather than LogoMaker binary files, or I'd upload the pair.

Send them as separate logos and they'll show up side by side in the list. That's a cute idea (drivers wanted/driver found).

Remember that the logo editor imports and exports bitmaps. If you're using Internet Explorer, you can literally right-click on one of the logos at the site and hit "copy", then paste it into the logo editor.