Most of these types use the same pins. The most visisble differences are in the springs that hold the pins in place. Detroit EZ locker uses two(2), an inner and an outer, with a little plug on the opposite end from the pin. Springs are moderately stiff.
Lock-Right has a single spring no plug. Springs are a PITA.
The one from 4WParts, Genuine Gear, uses two(2) springs, inner and an outer, no plug. Springs are easiest of the three listed to compress.
All of these work the same, and install the same way. I have found no noticeable difference in function.
They probably won't sell you the pins. When mine were broken they did send me some new ones for free though!
Call FootHill Off Road in Auburn and talk to Tom Grancy 530-889-2021