Fake Mario Odyssey red Joycons?

Just bought Mario Odyssey red Joycons off of eBay with the note that the right one had to be repaired, opened it up and was weirded out by the colour gradient on the outer shell. Apparently you can buy Joycon shells with that exact same colour online so I was wondering if they might not be original? Looks like the right colour on the outside but inside it’s a brighter red. Paid more for them than for new Joycons so I would be pretty bummed if they’re fake, would appreciate any help. Thanks in advance!