You can have both of them by following some simple instructions available here. I don't know the link, though. The way I do it is just making 2 data files (preferably 3, with one being 1.2) in the Rome folder. One called SPQR, the other RTR, and the last 1.2 (or anything you like) When you want to play any mod or 1.2, just name that folder "Data" and enter the game.
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