Heavymetalhead55

A lot of People of here seem to know a lot more then i do so i figured i would ask you guys for help. So I have a pair of klipsch rf 7 II's and was looking to get a pair of klipsch rf7 IIIs would it be ok if i used my rf7 II's as the rears and the RF7 III's as the fronts and kept the rc64II as the Center till i was able to save up for the rc64III. I Just read a couple threads on here how some speakers frequencies and stuff don't mesh well together so i was wondering if this set up would work well thanks in advance.