My guess would be they'll use the same codes.
It is a guess, but I think a well founded one.
The Sky+ remotes are a standard item that you can buy seperately.
Pretty sure the technical specification for all Sky boxes and remotes is set in stone. The manufactures just aquire permission to build 'em.
The different manufactures just account for cosmetic changes and some value added features (like optical out on standard Sky boxes from Sony)