Eh-hem...
They do show up in the classifides.
Thats like saying the fat girl and the thin girl are the same size because they're the same height.
The Glock 26 is BARELY an IWB gun. Its the same thickness as any other 9/40 glock, even if its short.
The Kahr can actually go in your pocket. Its MUCH thinner and MUCH easier to conceal.
Also, as far as length and height, the 26 is about the size of a P9, not a PM9
And just to put it all out. I owned a 26. I wanted to love it. I actually did really enjoy shooting it, especially with the pinkee extension like your pic shows. But I never carried it. It was fatter than my 1911s!!!
I shot a Glock 34 in IDPA for 10 years.. I still have the gun. Its a great gun.
But the Kahr is a CARRY gun. Thin and light, and strangely, capable of amazing accuracy.
The other great thing about the Kahr is that it functions exactly like a glock. So if you shoot a 34 in matches, your going to be able to work instinctively with the Kahr.
To the OP. If you intend to carry in a belt holster, you might want to consider the P9. Its a little longer in the bbl and grip. It holds 1 more round and allows you to get your pinkee on the grip.
To me a P9 is a great IWB gun. The PM9 is a great pocket gun.
Don