You can check the game ID by checking ASCII table and copy the entire folder, or you can use applications to transfer save from/To emunands. I think the channel's saves are stores in title\00010008\ folder. You can do it game by game (inside the Game Settings), or for all the saves at once (inside the Main settings>Features>Extract saves) Yes, you can copy your saved present on the real nand to the EmuNand. It's the same problem as using a neek nand with GX, it can work but it also can be problematic. The nand dumped by USBLoaderGX should work, but depending on the content of your nand it may not work correctly (some filename may differ from USBGX and other Nand dumping tools).
If you want to use your Memory Card, don't enable the NMM option in the game settings.
