Disregarding the fact that I don't have any Philly sales for Venom 1, presales are a whole different ballgame the farther you go back. Presales and advance tickets take up a bigger share of opening weekends and grosses every year, as more people are conditioned to buy tickets early and reserved seating is more common. Trends and patterns may not necessarily change (see the Jurassic World movies), but the volume of sales is very different. So because 2018 was three years ago, it's too far back to make comparisons worth a darn. You can really only compare movies from this year and maybe last year if you want a more concrete comparison.
As an example, Black Widow had more advance sales than Spider-Man: Homecoming in 2017, but it didn't come anywhere close to that movie's opening. This shows that Widow was more presales-driven and that films are more skewed towards advance sales