Yes, you should be good. 10-3 is plenty big for the size motor the DJ-20 has installed.
just to clarify The 12 foot length will be ok ?
Jon, I had a similar issue with my dust collector and found that buying an extension cord (with the appropriate wire) was less expensive than buying the needed cable. Cut off the ends that are not needed and wire directly to the machine. The ones I am using are orange and they are more visible on the floor.
Roy