Yes, they're thought to be similar, but astronomers are still trying to figure out exactly how they're related. (They occur at different times, the spot on Jupiter is, of course, red, and so on.)
In fact, it looks like the Great Red Spot on Jupiter has been getting darker recently: I suspect it will be part of our regular observations for some time, to see what patterns form.
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Yes, they're thought to be similar, but astronomers are still trying to figure out exactly how they're related. (They occur at different times, the spot on Jupiter is, of course, red, and so on.)
In fact, it looks like the Great Red Spot on Jupiter has been getting darker recently: I suspect it will be part of our regular observations for some time, to see what patterns form.