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A jet kit is a specifically designed kit that you purchase to improve the jetting in a bike. It usually contains main jets, proprietary adjustable needles and mixture screw recommendations.
Shimming is raising the stock, non adjustable needles by using small washers.
Both shimming and a jet kit are both working to improve jetting of a stock bike. Shimming is crude, effective way to optimize jetting by using what you have to achieve it. It will never be as precise or adjustable as a jet kit, but in the case of our 250Rs, it can improve an otherwise lean stock bike to be a lot more user friendly.
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