@ Grademan, that question can not be answered without more info.
What type of base do you have?? Is it UHF, or SS (915SS)? What type of radio does the Cat Sys, have??
If they are both UHF, then Yes, UHF's, can be set the same and the "language" can be set the same, CMR, CMR+, RTCM2.XX, RTCM3.XX.
If not you may be able to add some auxillary radios and broadcast both. There is a company that builds some cool cables to hook up different brands!!
I am not that familiar going that way, but our Topcon Systems will run just fine off a Trimble UHF base, Topcon has Trimble radio setting. Topcon seems to be alot more friendly working with the competition than Cat.
Most Localizations should be the same, NEZ coords, and a Lat, Long, Ellipsoid, In the cat stuff there should be a Control Point area to hand enter those items. I have manually entered many localizations in Topcon Units!! A bit tedious, but easy!!