Bill,
Here is what I could find out about these two Royal metal vacuums:
Royal 1020z - This is a commercial version of the Royal Metal vacuum. It has a 10 amp motor with blue zippered bag and blue 50 ft. power cord. Since this is a commercial version, it is a very basic machine with infinite SCREW height adjustment and NO headlight.
Royal 9700 - This is a Top of The Line residential vacuum that has a maroon bag and maroon 40 ft. power cord. This machine has a 7 amp motor with 5 position foot pedal height adjustment and it does have a headlight. This is one of the rare Royal models that has fancy chrome wheel covers.
Both of these machines are able to use the new Royal cloth filterette HEPA bag.
You may enjoy this video of a Royal 9700 kicking a brand new Dyson DC41's butt:
[this post was last edited: 3/31/2016-15:02]