Mine is an Eaton rear with Detroit gear locker. Detroit gear makes locking differentails for many different makes of rear.
The pictures shows what I call the "pumpkin" this is likely to fit only the same make as the rest of the axle. An Eaton to an Eaton, dana to dana, etc.
Looks like the Spicer you show is automatic locking, and the other can be locked or unlocked by the driver.