They all look the same mate, cept for the obvious bits.
a 2 pinion has 2 pinion gears in the center, where as the 4 has four (that's reasonably easy to spot)
and
open centers dont' have a clutch "basket" where as the LSD ones do, and look like they're almost fully enclosed. It's a damn site harder to see the pinion gears in a LSD.
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