Dual Extruder motors 2 to in 1 system calibrate esteps???

Is there not away to set esteps for second extruder motor? I currently have a A10M/2 in 1 color printer. Now Geeetech has both extruders set to the same esteps but as Im sure as we all know esteps are not always the same even with the same set up and same extruder. Can we not put in esteps say for e0 and e1?

Oh I should mention the highest version of Marlin they have right now is 1.1.8
Thanks everyone really appreciate the help as this printer would be so so nice if I could be able to calibrate both extruders!

Anyone???

marlinfw.org/docs/gcode/M092.html

"Requires DISTINCT_E_FACTORS" - if the stock firmware did not activate this, you are lost.

I'm not sure weather T0 vs. T1 selects the first vs. second motor or weather T1 vs. T2 would be correct instead. Maybe M92 will print the current settings for both (write them down) before starting.

Be sure to measure with dismounted hotend and to store the settings to EEPROM by typing "M500". The steps per mm is a function of gear and motor times microsteps - you should not use it to compensate for the effect of the nozzle (as far as I learned).