The Youle headshells are from around the 1960s and certainly no later than the 1970s. They are much older than the batteries which are probably from the 2000s. The battery boxes also look younger than the headshells.
The internal components of the headshells are different from Oldhams and most of the components cannot be exchanged between the two makes.
An issue with headshells when they get up to around 40 or more years old (whether Oldham or Youle) is that the wiring cast into the headshell deteriorates and no longer carries an electrical current. As the wiring is cast-in, it cannot be repaired or replaced.
Is your reflector plastic or aluminium?
When you unscrew the bezel, look for very fine black dust on the threads and also inside the headshell. If there is such dust then the headshells were at some point used in a colliery.