2001 Honda 25 HP bf25a air/fuel mix screws??

[twier]

SN BAJS-3210105
Can anyone tell me how to determine the air/fuel mix screws I need for my engine? I cannot figure out if the carb/engine is SNBG10B B OR SNBG20B A.
Parts diagram says part
16016-ZW1-L41SCREW SET | Use from Engine SNBG10B B.

16016-ZV7-B51 SCREW SET | Use up to Engine SNBG10B A.

I cannot determine what the SNBG10B designation means.

Thanks