Do not know about impact but Ronan Farrow's Weinstein story was published in October and put together over the course of a ten month investigation [0]. Susan Fowler's blog was posted in February. I'd imagine Farrow probably started on his story before the investigations started; especially since Weinstein was a well-known story. If Farrow's article was posted before Fowler's, I want to say that there would still be the same reaction. A lot of people had no idea about Fowler and Uber but people definitely know about Weinstein.
I remember there was an episode on the podcast The Daily where Michael Barbaro interviewed a reporter who worked on the Harvey Weinstein story. I think they said that The New York Times had tried to pursue this story in the past, but they really wanted to make another push for it this year to expose the unreported stories of sexual harassment.
[0] https://www.newyorker.com/news/news-desk/from-aggressive-ove...