So, my situation is kind of confusing. I have two old 3DS Systems that both have data on them, and i want to transfer the data from both systems on to one New 3DS XL. I have already transfered one of them that did not have my nintendo network ID linked to it to my New Nintendo 3DS XL. I now have another old 3DS XL that i would like to transfer the data from to my New 3DS XL. This other one has my nintendo network ID linked to it, and has a lot of downloaded games on it, which is why i would like to transfer it. My New 3DS XL does not have a Nintendo Network ID linked to it yet.
My question is, would i be able to transfer the data from my Old 3DS XL to my New 3DS XL that has already gone theough a transfer, without losing the data already transferred to it? Would i lose anything in the process? Lastly, would i be able to use the current micro Sd card already in my new 3DS XL? Because my old one is using a normal sized SD card.
Thank you for reading about my weird situation, and thank you for the help in advance.