I can absolutely guarantee you 100% that the URC-6131 and URC-6131 are identical (from a programming and software point of view) the only difference is in their physical appearance. This is regardless of what info may or may not appear in their printed manuals or on the OFA web site. Hopefully that's definitive enough for you! :)

Also, I could pre-load the code into any of the JP1 remotes that I offer for sale on my web site if the 6131 doesn't appeal.