@mrnoholster yes. just launch the other version. note, if you're using a split romset you will need to include the parent rom (typically the one without a revision in the file name) in the same directory for dependencies to be met. if you're using a non-merged romset it won't matter - each rom is standalone and should launch.

any problems please fill out https://retropie.org.uk/forum/topic/3/read-this-first including verbose log