440Pro - Difference between Master/Companion?

[garyUK]

@Confused    Thanks - Glad to be here.

@All

So some have BL 2.9 and others BL 2.C. It just seemed a bit strange to have one of each. As mine started off as a 440 Pro CI I expected both to be the same which is why I asked Devialet.

Thanks for replying.