OK...let's see here...
CP8 = unnecessary. This is simply the power supply, and given that B. is working in Eurorack here, fitting a 1:1 for the CP8 would be pointless...and also, a real space-waste. Just use the B. CP-1A and feel the warm fuzzies that result from saving valuable panel space. Or, better still, if this is being built into B.'s 2 x 140 cabs, just use the onboard P/S.
CP3 = Behringer equivalent would be to pair the CP3A-0 and CP3A-M. This, however, is only a thing if you're opting to use the backside bussing for your control signals; if not, all you'll need is the mixer.
CP2 = No real substitute. The filters of the B. 923 would work here (albeit without the preset detented filter values...which, actually, is an improvement), and the rest of the module you REALLY want nothing to do with, as it's part of the original Moog "S-Trig" setup, and we don't use this because 1) it's Eurorack, and we don't use S-Trig there and 2) S-Trig SUUUUUUUUUUCKS!!!!! If you've ever used a modular Moog, it's the first thing you come to hate on the system, because if you put too much of a load on the S-Trig bus, the lack of input buffering will cause a voltage sag that'll have it triggering randomly and annoyingly. A hangover from the very beginnings of the Moog that almost no one adopted back then because the engineering shortcomings were even glaringly fubar in the 1960s. In fact, compare the Moog 961CP with the B. 961...the arrangement of V-Trig and S-Trig outputs is pretty much reversed, with the Moog having the ability to convert V-Trig to loads of S-Trig outs, and the B. doing the exact opposite, and that really only for a certain degree of "historical accuracy".
993 = Again, this has to do with the bussing system Moog used to "simplify" patching. In this case, it's a way to "backplane" the triggers and envelopes between a pair of EGs and the two VCAs. Not something essential, and in fact it's something potentially confusional. Frankly, the bussing on the expanded IIIc (the 55's predecessor) I've used in the past was something I found really pointless, as I prefer being able to patch ALL of the signals and not rely on "cheats".