Yes, as others have mentioned, the ST & MP 6607s are for the same applications. I believe they even use the same filtration media however IDK if this has been completely confirmed. Also, the ST uses a BLACK nitrile(rubber) ADBV while the MP used a BLUE silicon ADBV.
I have a hard time with the...only thing justifying that that the MP filter gets double the life & price over the ST is the ADBV. Not that I think that there is anything else going on with the filter from videos of teardown of the filters. I mean, the can thickness is the same, the filtration media seems to be the same in terms of mm's thick & total length, the baseplates are the same, the pressure relief valve is the same as is the micron rating.
So for me, the MP being same filter as the ST with just a silicone ADBV(IMO) is not worth double the money unless you just can't find the ST for your app. ATMOF, the ST & MP filter is the same filter as the AC Delco filter for the FIREBIRD in my signature. Both are cheaper than the AC. Guess which one I am buying?