What is the difference between Shao Xing and Shao Hisng Chinese cooking wines? Some people say that Shao Xing and Shao Hisng are different names for the same thing yet others say Xing has added salt.

Could someone please shed some light?
Shao hsing is just another romanization of mandarin Chinese (Wade Giles) for Shao xing :
https://en.wikipedia.org/wiki/Comparison_of_Chinese_romanization_systems