Yes and I've called Sennheiser UK today to ask about it...awaiting a reply. I've seen a couple of posts regarding this and as I've only ever tried the mic cable, I plugged in the non mic cable today to try it and there is a big difference in SPL as well as SQ.
Well I can say that the Amperior's cable has both a mic & volume control with a different design of cable and it seems fine. The difference between the two on the Momentum's is not a subtle or minimal one - as the original poster states - it's dramatic, as in a huge difference.
Has anyone tried the cable plugged into something (like port amp) that doesnt take advantage of the mic/volume rocker? Curious if it would sound the same. Tonight i'll try with both, plugged into my FIIO E17.
FWIW I have an older shuffle... the little turd with no buttons on the thing. I won it in a raffle so I didn't pay for the stupid thing. When the stock iPuke buds bit the dust (which didn't take long btw). I bought a little adapter cable with the buttons on the wire. It noticeably degrades the sound quality as compared to directly plugging into the turd with no adapter (and no button control). It was a cheap generic 3rd party adapter though, not anything auth'd by apple... FWIW. I probably should have bought one from scoche or a more reputable company.