No. The individual letters were also of the green but the last letter of the code was different.
the Stab of the I Gruppe had the black B
the Stab of the II Gruppe had the black C
the Stab of the III Gruppe had the black D
the Stab of the IV Gruppe had the black F
the Stab of the V Gruppe had the black G
If you mean the HWK 109-500A-1 (Walter Ri-202) rocked-assisted take off (RATO ) units .. they were working 30s and then were jettisoned to fall the ground by parachute. The accelerator was also called Rauchgerät .