I don't think there are USB sticks for the USB port PreSonus uses in their mixers, but it was said that some day in the future it will be possiible to use a SD card for this purpose. 2020 is still a long year...
The normal way you can transfer project/scenes and any other settings and presets is via UC Surface. Just copy a setting to UC Surface "local" (computer or tablet) and from there to the next mixer. It's that easy.