Very unlikely - they have thread in it, as well as bed. Threads in these things have to be perfectly aligned with thread in bed or they will not sit on bed properly - they will be slightly higher on a mounting pin.They bolt between the bed of the lathe and the sheet metal pan to stabilize the lathe bed. Mine arrived with only two so I fabricated a metal puck for the tailstock end of the lathe.
Those rails are for mounting the lathe to a bench top. You don't have to use them even then, but if you bought the cabinet they are not needed.