It tells you something about that when you try doing the system transfer. I also found a page on it too, on nintendo.com. You could've saved yourself asking the question by googling first.
Here's the link:
https://www.nintendo.com/consumer/s...ransfer&submenu=ctr-gi-apps-transfer-overview
tl;dr: All content will be transferred from the source system to the target. If content eg. savegames are present on both systems the data from the target system will be discarded. All purchased content from both 3DSes will be kept. Photos and sound files as well as save/extra data for built-in firmware apps will be overwritten on the target system. The source system will be formatted.
Here's the link:
https://www.nintendo.com/consumer/s...ransfer&submenu=ctr-gi-apps-transfer-overview
tl;dr: All content will be transferred from the source system to the target. If content eg. savegames are present on both systems the data from the target system will be discarded. All purchased content from both 3DSes will be kept. Photos and sound files as well as save/extra data for built-in firmware apps will be overwritten on the target system. The source system will be formatted.
If I already have my Mii and a lot of information on my Mii Plaza on my 3DS XL, will it all be erased? isn't there a way of erasing that data from the Ambassador 3DS so that it doesn't overwrite my current pre-installed data of my 3DS XL?
By the sound of it, it will be erased, but check the page I linked, there might be a mention about it there.
You gotta wait 7 days between transfers.
EDIT: I'm not sure if that applies for Unit 1>Unit 2 then from 2>1 but from 1>2 and then again applies.
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