S2 with multi entries with 6 months or a year

I want to apply for a S2 visa with multi entries of 6 months or a year, are the requirements of the needed documents the same as S2 single or double entries or they are different?

If I want to get a S1, does it also need the same documents as S2? The only difference is if I want to stay in China more than 180 days, I will need S1 instead of S2?