Danoh1989 posted...it overwrites mario kart but mario kart will be in your redownload list on the eshop
How is that possible? Your system is tied to your shop account and MK would be tied to the XL shop account that would cease to exist. IF you were just formatting the system memory on the XL you should be able to redownload it, but the XL will effectively become the old system after the transfer. What you're suggesting would require the games from BOTH systems to be in your download list in the shop. Not gonna happen.
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