It may be good to actually measure the can yourself. It is more or less the same.
I got two M1 filters with the autozone deal. In my case I go for it to get the 0w-40 at a better price, don't really want the filters, but will use them.
What I see is that the filter is pretty nice, but should be like a RP for the 12.99 charge. The claims on box are conservative, 2x Fram Extra Guard holding capacity is what I think they are getting at. I think the P1 is just as good, maybe better, in all ways for much less. It really is hard to beat Purolator these days, in a USA made filter.
On an M1-103, I looked inside, and saw the slits on the center tube. They weren't closed, but not wide open either. So I got two other kinds I could use. Those had the standard round holes center tube and base end bypass. The 103 had the dome bypass with blue button. That looks just like the ST for the same application. The 103 looks an awful lot like the $3 ST I am afraid, aside from the media and adbv.