For movie watching it is not necessary for matching surrounds.
However, i can think of two reasons to get matching Aperion surrounds:
1. If you are going to be enjoying multichannel music listening
2. If your current surrounds appearance doesn't quite stack up to Aperions first class looks.
Now is it worth the extra $260 for a pair of 4B's to get the best integration and keep the aesthetics rocking? If you have the money, then i say yes. If not you will not really notice much of a difference when enjoying for favorite flicks.
I think the goal however is to always have a complete timbre matched set of speakers.