Why are designs on 1 oz gold Kruggerand slightly different in some years?

For instance in 1982 reverse there is less detail in the landscape versus just about any year.

In the 2008 the little pips around the rim look separate and elongated versus the more rounded and short pips say on a 1974.

Thanks for any insights.

 

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Different engravers going off the original design but adding there personal "touch"
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