SHIMANO cassette joint question

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I ordered a spare cassette joint going by the cassette joint model (CJ-8S20), but not all parts match. Does anybody know what's going on?

cj_3_1427.jpg


Correct CJ-8S20 on the left -- all metal parts, thin unit
New and incorrect CJ-8S20 on the right -- one part all plastic, thick unit



cj_1424.jpg


Correct parts on top. The same model number is on both assemblies!

cj_2_1426.jpg


Proper part on hub gear. The replacement part does not fit.

Does SHIMANO use the same model number for different products or what?
 
I seem to recall having a similar problem with Shimano parts about 15 years ago. I needed a gear, ordered one, part numbers matched but the part did not fit. I just gave up on the bike at that point.
 
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