lmoengnr
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They are 'detent' type of clips, they should compress into the groove when levering the stub shafts out of the diff.I'd say that's the difference. Someone like @lmoengnr would probably know. I didn't realise you had a HSV.
All ZF diffs should have them fitted if the stub shafts have grooves cut.
Try the old clips on the shafts, if you can't shake them off the shafts in their relaxed position, they should be ok to re-use.