Not if they're AC motors; in that case, they would need separate controllers, appropriately coordinated.There is a hub motor in each of the 2 rear wheels. ...
I am assuming that there is one controller working both motors.
A differential effect just means that they can run at different speeds. What torque is applied to each wheel, and how that changes due to the speed differences caused by cornering and by tire slippage, depends on the details of the configuration.I have read somewhere that doing this produces an automatic "differential effect"....or not?
If you find an English web page for this trike we could look at what it says, but without that it's just speculation.