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Lanterns use pumpkins, which are orange in complexion, while watermelons are more grayish-green in appearance. Watermelons also do not have a black stem sticking out of the top of it, unlike pumpkins. The final difference is the equatorial distance between the two. The pumpkin does not stretch as far at the equator as the watermelon does. In fact, the size, shape, and possibly even the weight of the two differentiate between each other.
The first Jack O' Melon displayed in the episode Summerween was the one held up by the Summerween Trickster, which he used to threaten the gang.
The last Jack O' Melon seen is at Old Man McGucket's house, in which Grenda steals it from him forcefully to prevent the last Jack O'Melon from being blown out (though this effort fails in the end).