The Commodore 2031 LP is a single unit 5.25" floppy disk drives for Commodore computers. It looks like a 1541 drive but uses the IEEE-488 interface common to Commodore PET/CBM computers. Essentially, it's a single drive version of the Commodore 4040.
The Commodore 2031 was functionally the same as the 2031, but looks a little different and was intended for more business use.
These drive models used a similar single density, single side floppy data storage format to that used by the Commodore 1541 drive, but with a slightly different data marker indicating which model originally formatted the disk. The low level disk format was similar enough to allow reading between models, but different enough that one series of drive models could not reliably write to disks formatted with one of the other model series.