noob question on locker in diff

so im decided to strip my second hand ax10 i got and clean and check everything out and learn something about it all at the same time. i have a print out of the manual to help me but the heavy duty locker that is shown in there is very different to what i have found in inside mine? is this one good, bettet or what? also found the front diff was clean inside but back one was full of dirt. would there be a reason for this?

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