I know this isn't what you asked, but my P-07 Urban Grey (threaded and suppressor sights) fits in my High Noon holsters that I have for my GEN2 P-07 (the Snapper and Sky High models). Of course the thread cap sticks but that's fine with me as I don't plan on carrying my Urban Grey. I was just curious the other night and tried the UG in the holsters and was sort of surprised they worked, I thought the higher sight might cause problems.
With all that said, since the thread protector sticks out on the P-07 holsters maybe the P-09 holster length would be perfect (which is what you are asking). I don't have a P-09 to measure the length and compare it to the P-07 with threaded barrel length so I'm interested in the response from someone who may actually know.