Yes, unless you're mistaken and the upper receptacle has three prongs. Sometimes 401s are wired so you can either plug in the separate foot (knee) control unit below - OR - use a three prong power-cord-and-foot-control combination, ignoring the lower receptacle. Have another look to see if the upper receptacle is only two prongs; if so, the 3-prong-type power cord will work just fine for power and you can remove the foot (knee) controller from the cabinet and use that.
401 is my go-to machine for just about everything. They're terrific, intuitive, sturdy machines.
ETA: Oops, I was replying at the same time as Rodney.
James