The Seahawks sacked Jay Cutler six times in a 23-20 win on Oct. 17 at Soldier Field, and the rematch will be in an NFC divisional matchup in Chicago.
"They're playing great defense," Carroll said on ESPN 710 in Seattle. "They have a legitimately strong running game, and a quarterback who can do whatever you want. This is a really hard one.
"They fixed that stuff [from the first meeting]. They're not turning the ball over like they were early. They're not getting sacked like they were early. They're just going to a balanced attack that really seems to help them."
The Bears opened as a 10-point favorite, but Carroll believes the Week 6 win could help his team, which overcame a double-digit spread to upset the New Orleans Saints on Saturday.
"We get to go to a place where we've been before, and we had success," he said. "So all of that helps. It is good to have in the back of our minds that we know the setting, and we've been up against them, so we have a sense for that. That helps you more than not having that knowledge."