The Sporting Kansas City loanee scored one goal and played a significant part in another as the Canaries came from behind to secure a dramatic 2-1 victory over Everton
Kamara emerged from the bench to score the equaliser and play a significant part in Grant Holt's winning goal at the death as Hughton's team cancelled out Leon Osman's first-half header.
"When you bring on subs it's to affect the game," Hughton told reporters. "That's probably more important than scoring a goal, is how a player can affect the game, and certainly with Kei he's a different type of player to what we've got up front.
"He's not up to speed yet regarding his fitness, but he's something different. I'm really delighted for him.
"We were aware of him a while back and have a chief scout who was aware of him. He'd already been over before [with Stoke] but with this it's all about timing.
"It was right for us, we wanted to bring in someone in that area. It was a bit of a risk, you don't know how quickly these players will settle into the league, but he's lad who wants to do well."
Norwich had struggled to create chances prior to Kamara's introduction and Hughton admitted he would have settled for a point.
"At 1-1, I thought we absolutely deserved that result," he added. "We were up against a really good Everton team and when you break there's a chance you can get caught on the counter.
"The lads showed great drive and determination to get a winner, but at 1-1 you have to be honest and say you'd probably settle for that."
Everton manager David Moyes, meanwhile, complained at the amount of added time played after Holt scored with virtually the last kick of the match.
"I can't understand why he played three minutes and 20 seconds [added time] for the goal," he said. "I think 20 seconds is a big percentage to add on to three minutes [that was indicated].
"He has the discretion to do what he likes but I disagree with his discretion today. They can make up anything, but I disagree with what he claimed was his discretion."
The Toffees boss felt his side did enough to secure three points but conceded that they now face an uphill struggle to qualify for the Champions League.
"We controlled the game well enough, but we weren't good enough in the final third to get the second or the third goal," he continued.
"One thing's for sure, we didn't deserve to lose the game. I thought we started to protect what we'd got a bit too early, and we paid the penalty.
"It's one game out of 12 that we had before today's game. There's still chances for us to do [finish in the top four], but we're going to have to be very good."