Those two carb serials you list (135763 and 142985) are not affected by the circlip bulletin ( see https://legacy.rotaxowner.com/si_tb_info/serviceb/sb-912-073-ul.pdf )
However, do not attempt to use a 914 Carb for an 912S engine!
The 912S requires a different design of carb to operate properly.
For your 912S engine, use only these carbs:
1/3 part no. 892530
2/4 part no. 892535