I'm guessing that just because 480's and CK1s will screw together with adapters and put out a signal doesn't mean that they are intended to work that way, or generate intended frequency response... case in point Nak 100 and Nak 300 parts mixed/matched sound less than optimal (been there, done that).
If you put them together and like what you get, that's fine. But I suspect the AKG engineering department didn't see them as accurate. If I mix and match parts from 2 bathrooms scales and one reads 10 pounds light, and one reads 10 pounds heavy, neither is "accurate" but most people will LIKE the one which reads 10 points light. If you want more sizzle, and this combo gives you more sizzle, you will like it, there is nothing inherently wrong with that. You won't find Chevy engineers recommending you drop a 350 V8 into an S10 pickup but people have done it, and they like the results.