Does anyone know if the kydex shells from Old Faithful and Alien Gear are interchangeable between backings. I have an IWB from Old Faithful for my shield and saw that Alien Gear sells just the backing for an OWB holster. I'm wondering if I can just buy the backing from Alien Gear and use the shell I have from Old Faithful. Just from eyeballing the pictures, they look the same but wanted to know if anyone has any first hand knowledge. I've sent a question to the company last week but haven't heard back.

Yes...I owned both, same time, and had shells for my old SD40VE and my current 40c. Yes they are. Everything is.
You're good to go.

OF and AG have merged, by the way...

Great. Thanks for the information. I appreciate it.