Would the Marklin HO 1323 switch work with the Marklin 1071 electric motor?

If the 1071 motor is modified as described in this forum a few days ago you could use the
1323 switch as the SPDT (and off position) switch.
Both the 1071 and 1072 are ‘universal’ motors which work on either AC or DC current, they have wound field magnets, not permanent magnets like DC only motors have. Because they each have two field windings - one for clockwise and one for anti(counter)clockwise direction is selected by which field the current passes through. They are both ‘series wound’ motors which means the current passes through the armature via the carbon brushes and then through the appropriate field winding. So as current increases with load through the armature the current also increases through the field coil strengthening the magnetic field. Some other motors might be parallel wound such as full size older electric trains.
The analogue Märklin controllers are ideal for these although I use LGB controllers which have
higher voltage and current possibilities.

Later Märklin Metall motors had permanent magnets for the field, they could still be used with AC because they included diodes to convert the AC to DC.
ChrisG