Nevermind, so dumb I am. OK go read this:
FAQ--How to Create Additional Template Set's in Reviewpost
Now, you already have the two tmpl files named xxx1.tmpl so open the other files listed and do a SAVE AS to make them xxx1.tmpl files. Upload those files to your templates directory.
Go to the admin section and edit a category, there you will find this:
Template for category:
(leave this alone if you want the default! otherwise set to 1 for the alternate set)
Instead of the default 0, enter 1.
Save and you are good to go!