Imo (lots of people would say NO) try it, play around with it before restoring titanium and see what you think. Use the same gapps.
Really though unless its a step up from the same rom then NO, wipe everything 1st.
Actually im gona tell u to atleast format /system first because PA has so many changes to android over CM.
.......try it... it wont harm but if you plan to keep using it, do a system and data wipe :beer: