Re: how do i switch full sd card with new one without losing any memory files
It's definite that any app moved to the SD card won't get copied to the new card. If you have apps that you moved to the card, either back them up and reinstall them, then move thm, when the new card is in the phone, or move them to the phone before switching cards and move them back to the card after switching.
Apps on the SD card aren't identified by name in a directory, but by location on the card. They won't end up in the same location on the new card, so the phone will report a missing app. (Named files can be anywhere - the directory points to them. They're found by looking up the name in the directory.)