https://www.emtbforums.com/community/threads/brose-1-3-motor-vs-brose-1-2e-motor.978/#:~:text=Newbie,-Jul%206%2C%202018&text=It%20has%20the%20same%20hardware,also%20around%20%30%20less%20power.
E' stands for 'Economical'
It has the same hardware as 1.2 motor but it is tuned to consume less...