Difference between VEX gears?

Is there a real difference between the red gears and sprockets vs the green ones? Is it just one is older than the other?

There’s no difference.

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The main difference, is that some of the newer high strength red gears will have a built-in metal insert for HS axles, whereas the older green ones won’t.
Essentially, if the gear is red, and has a metal HS insert built in, it will be stronger.

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it depends on which one it is, but there are better holes on the red ones for alignment

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I think the red gears are stronger and easier to work with.