Walcott insists they're a different proposition to the team that was swept aside by Barca in last season's Champions League.
"We're looking forward to it, it's going to be a great, great battle," he said.
"It's one of the games you want to play in and hopefully the result can be different from last year.
"I believe we can do much better than last season; we can't do worse to be honest," he said.
"It's going to be an open game but these days when we lose the ball we try to get it back quicker.