I did that same ANR conversion in a H10-13.4, and used them in a B1900. Definitely quieter than stock, but the ANR wasn't quite flawless. Rapid head movement caused significant distortion. I replaced that headset with a David Clark ANR H10-13.4X. Very nice headset. About the same noise reduction, but more solid ANR, didn't matter if you moved your head, rested an earcup against a vibrating surface, whatever, it's rock solid. Battery life similar, but the converted headset slowly died, with the ANR getting progressively worse and more distorted and obnoxious. The DC appeared to be regulated, with flawless ANR until it gave up entirely over the course of 10 seconds.
I'd recommend the full-blown David-Clark unless you're dearly strapped for cash, in which case protect your hearing by any means necessary.