The Ravens’ 35-10 victory over the Buffalo Bills in Week 4 was impressive, but it’s also ancient history.

That Sept. 29 game is relatively irrelevant heading into Sunday’s much-anticipated Ravens-Bills rematch in the divisional round. For starters, the Bills will be at home, where they are unbeaten (9-0 including the playoffs) and have won by an average margin of 17.4 points.

In September, both teams were trying to figure out the best version of themselves. Four months later, Baltimore and Buffalo clearly look capable of winning the Super Bowl, but only one will advance to the AFC Championship.

When Head Coach John Harbaugh looks at the Bills, he sees a formidable challenge.

“So many things stand out – they’re such a good team,” Harbaugh said. “All three phases are playing at a very high level. I think the biggest thing that stands out is how well-coached they are, how well-tied together they are – they play complementary football. All three phases play off of each other – they have a defined personality in every phase. And as a team, they’re very physical; they play very hard; they’re cohesive; they’re on the same page.

“The quarterback obviously is playing at a high level. Josh Allen is a great player. They’re well built around him – they did a good job of building the offense around him, and they have a lot of complementary pieces.”

Here are some ways in which the Ravens and Bills have changed since they met in Week 4: