This is actually a very complicated question.
There are plenty of pistol manufacturers who do not make their own magazines. Instead, they contract those out. Sometimes they pay to have their markings on those mags, sometimes not. To muddy those waters, there are companies turning out OEM magazines that also make "reverse engineered" ones, too.
To twist this a bit more, some pistols use the same or similar magazines. The West German P220 uses a heel mag release--those mags are not easy to find. But, Browning BDA (a copy of the 220) magazines work nicely (it not that much more available). And there are models which are copies of other arms Taurus & Berretta, for example.
It's something that occasionally wants research.
Which is doubly so when dealing with the "better than OEM" magazines. Is a Wilson better than a Shooting Star, or a Pachmyr, and so on. Best bet there is to ask a lot of people. Like people here, come to cases. Occasionally, we know stuff.