It "should" be the same threads as the one Addison used. I'm 99% certain. All these lights use same switch.
About the LED's, they are all knockoff's. Cree doesn't make a XHP-90 and the 10-XM-L2's in mine arent genuine. That being said they still might ok quality, I haven't done testing yet.
I wish I could buy one of these lights without the threaded hole and the switch. Measure the thread diameter and pitch of the piezo switch, then drill and tap it myself. But that will never happen because how these lights are mass produced. There's a bunch of smart people on this forum, hopefully someone can think of a *simpler* solution!