[Lynn Eades]

The knobs are square edged
The bronze part is longer between the screw hole centers.
The screw countersink is a different angle.
The spindle is a bigger dia.at the index (business)end

...and the arm is different, and so is the window frame.

Things you can interchange;
Bogie axles and bearings
return roller axles and bearings.
steering box worm and sector shaft
Fibre cups.
Suspension rods (with nuts)

Not much else.

Roy , you have done a nice job. Well done!