You may do well to email the company and see if they are interchangeable or find out if other holster makers are listing off a single holster that fits both of those guns. I know Blackhawk don't always list off what will fit in the holster on their website or the packaging. I carry a Glock 20 in cold weather months, Glock 29 in warm weather. I bought the holster that was marked for the 20/21 and wouldn't you know it the 29 fits in there exactly the same. Only difference is length of grip and slide/barrel length. These holsters seem to work partially on the shape of the gun but mostly where the trigger guard is located and shape.
The adjustment that this holster offers is kind of minimal. The best way I can describe it lets you adjust how snug the gun is in the holster. Its already a mostly snug fit with a touch of wobble and play while in the holster, but you can tighten it up so there is no wobble.
You should probably be aware there has been a bit of controversy about this holster and accidental discharges. I'm not knocking the holster as I use one myself, just making you aware that an issue does exist. If you google "blackhawk serpa banned" you'll see what I am talking about.
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