There are absolutely big differences between the two.
-Watson has MANY more accusers than Big Ben did.
-We have seen text messages and social media conversations between Watson and multiple women.
-We are in the day of social media and the "Me Too" era.
Those are three major differences. In addition to that, the NFL didn't have a public history of "botching" discipline for cases of alleged assault and abuse like they have over the past 10-15 years. They are going to want to take a strong stand.
If I'm wrong, I'll admit it, but I HIGHLY doubt he only missed six games this year. I'm not going to say he's "suspended" for six games minimum, but he'll at least be on the exempt list for more than six games.