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There's a few potential factors:
- the memory management chipset in the USB drive is different from the older unit to the newer one
- the memory itself is different
- the file format of the drive may be different
- if you aren't exporting identical content to each drive, the write times will differ
- if one drive hasn't been exported in a long time there may be more files to export
- if you have them connected to different USB ports on your computer, one may be USB3 and one may be USB2