Is there a difference between the two kinds of Genesis cartridges

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Keep your classic game library intact and protect your games from dust with the Retro-Bit® cartridge case for Genesis® and Mega Drive games. This

Retro-Bit Cartridge Case for Sega Genesis and Mega Drive

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Is there a difference between the two kinds of Genesis cartridges here? I'm used to the ones on the right, the ones on the left I've never seen before. : r/SEGAGENESIS

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