The only way to work it out is to analyse the wiring. Basically it's a large switch, and there are 2 relays inside it I expect. Probably they use the same type relay. Usually 2-pole relays, normally-open type. The actual circuitry for the L N E wires to the car from the mains is very simple.
Research the connections in the Type 2 plug & make sure you know exactly which one is L, N, E.
I expect the E wire to go from the mains through one relay, straight to the E on the car. You should be able to trace the wiring through the PCB, it will be a very large track. Only one pole will be used.
I expect the other relay to have 2 poles in use, one pole for L, other for N.
Sometimes the mfr uses 2 relays in series, so you may find L & N going through one relay and then another. This is a technique to make it easier for relays to cut out any arcing that may be happening when trying to stop current slowing, but I think it's unlikely.
More clues about what's what:
You may also find the L & N wires going through a circular ferrite ring = Current Transformer (CT), this will be a Residual Current Monitor detection device.
You may also find the E wire going through a CT, this will eb PEN-fault detection device.
It's also possible the E might not go through a relay. Domestic appliances will be permanently connected to E for safety, but outdoor things like an EV granny charger should really have PEN-lodd protection built in, which needs to be able to isolate the E line as well as L & N for complete safety. There are situations whe the E can go dangerously high voltage through no fault of the car or the house or the homeowner!
Here's a link to how a wall-mounted EVSE can be made, in essence it's identical to a granny charger. This one has all the latest safety features in, PEN-loss detection & RCM (DC 6mA leakage current) optional device.