the r4 ultra was made by acekard and while i don't know for sure those skins might transfer. other cards which use a fork of the wood firmware will also transfer. most clone companies (even cyclods) have used parts of the opensource wood rpg code in their firmware. your best bet would be to grab an acekard skin and see if they look about the same.
as already stated the roms will work. saves should work if they are using the raw format (which they probably are). if not you can always use the save converter. if your save type is not supported just submit some saves to shuny.
-another world
http://www.shunyweb.info/