The Denver Broncos who come to Seattle with revenge on their minds this weekend are not exactly the same Broncos the Seahawks demolished in the Super Bowl.

Sure, John Fox is still their coach — one of the best in the league — and they still have the legendary Peyton Manning at quarterback. But so many other things have changed.

On offense, Eric Decker and Knowshon Moreno left in free agency — replaced by free-agent receiver Emmanuel Sanders and second-year running back Monte Ball. Left tackle Ryan Clady is back after missing most of 2013 with a foot injury. And top slot receiver Wes Welker returned this week after his suspension was overturned thanks to the new drug policies ratified by the union and the league.

Even with the changes, Manning has been typically masterful in Denver’s 2-0 start, completing 69 percent of his passes and throwing for six touchdowns.

“They’re terrific,” coach Pete Carroll said. “Their whole system, their function, their tempo, their style of offense, the intricacies, the concepts of route running and all that. Really, it’s impeccable. They give us every challenge that you could ever want, and they’re off to a great start.”

Despite the early success, Manning says it’s still a work in progress.

“I feel like we are still learning,” he told Seattle reporters. “We’ve just played two games and we are still learning about kind of who we are and what things we’re good at and what things we aren’t quite as good at. We haven’t had Wes these first two games, so we’ve been adjusting a little bit.”

Without Welker, the Broncos have been running with two tight ends a lot — and Manning has made good use of them. Julius Thomas has four of the six TD catches — he and Ben Coates (1994) are the only tight ends since 1970 to catch four TD passes in the first two weeks — and Jacob Tamme also caught a scoring pass last week.

The Seahawks were great at covering tight ends last season — they held Thomas to four catches for 27 yards in the Super Bowl — but San Diego tight end Antonio Gates scored three times against them last week. Are they ready for Thomas this time?

“He’s really good,” Carroll said. “He’s a prototype down-the-field catcher. He can really get you. They’ll use him outside and try to get him on corners or match up the safeties outside with him and throw him stuff that wide receivers usually catch — and he can handle it. They know exactly what they have in him, and they use the heck out of him. He’s a big force.”

With safety Kam Chancellor still working his way back into form, Thomas could be a problem for the Hawks.

And then there are Demaryius Thomas, Sanders and Welker.

“Every one of their guys seems to be used beautifully,” Carroll said. “They really get it and do a great job with their guys. Emmanuel Sanders has been a big factor — 14 catches already, a lot of yards. They really know how to utilize their talent.”

Asked if he thinks Welker will play, Carroll said, “I think so. They’ve done a lot of stuff without three receivers in the first couple games like they did last year when he wasn’t there. So we have to prepare for both ’cause they could go either way.”

The Seahawks are coming off a rough defensive performance in San Diego, and Carroll says the defenders are eager to redeem themselves.

“I don’t think we … played like we can,” he said. “The third-down emphasis was really the story. They did a great job on third down against us and were able to keep the club moving. We got a lot of (defensive) plays on a very difficult day, so it just added up. They’re really anxious to bounce back and show a really good game. It just happens to be the Denver Broncos and Peyton, so it’s going to be hard.”