You can differentiate the hot ends through the shape and color of the nozzles.
Before use, please update the Touchscreen firmware, Auto-tune Hot End PID, redo Heated bed leveling and XY&Z Offset Calibration.
If you need to use Dual Hot Ends (0.2mm/0.4mm/0.6mm/0.8mm) or Dual Hot Ends (0.4mm, Hardened Steel), please refer to the following instructions:
Before use, please redo Heated Bed Leveling and XY&Z Offset Calibration.