Before Friday’s Islanders-Rangers match, Barry Trotz was looking through the numbers and realized that, at five-on-five, there was little to no difference between the two teams.

And, though the Rangers are among the league’s best on the power play, that suited the Islanders just fine.

“Obviously that’s [associate coach] Lane [Lambert’s] forte and it’s his area of expertise,” Trotz said. “He puts his heart and soul into it and the players understand that. He’s got good adjustments and good reads and we’ve got good, intelligent players in those roles, too.”

It showed again in a clean three-for-three showing in Friday’s 3-0 win against the Rangers, the Islanders are 22-for-25 (88 percent) on the kill since the injury and just shut down the second-best power play in the league by percentage.

In a low-event game where the Islanders mostly managed to play to their style at even strength, two first period penalties could have derailed things. Instead, they came and went, four minutes off the clock, and little to worry about. That’s how it’s gone lately.

The Islanders have taken the fewest penalties of any team in the league, and yes, in playing their 67th game on Friday, they have more or less caught up to the other 31 teams in that category. Though much of the machinery that made them so good in the two seasons before this one has broken down, this cog has stayed working.

That’s in no small part due to Semyon Varlamov — who had 27 saves on Friday — and Ilya Sorokin, who have combined to put the Isles second in the league in shorthanded save percentage.

But this is not merely a balancing act from the goaltenders.

“We have a lot of guys that can kill,” Casey Cizikas said.

On Friday, the Islanders again proved the truth of that.

Before the game, Trotz ran down the Islanders’ penalty killers on the back end, all of whom have contributed recently. That has been by necessity.

When Scott Mayfield and Cal Clutterbuck went down with a season-ending injury at the trade deadline, the clearest point of impact for the Islanders was on the penalty kill.

At the time, Clutterbuck led all Islanders forwards in ice time at four-on-five. His style of play — grinding, straight-line, hard-hitting and safe with the puck — fits the penalty kill perfectly. Ironically, his ability there was perhaps the biggest reason to suspect Clutterbuck would be on the move at the deadline, before his signing an extension and undergoing season-ending surgery.

Without him, though, an Islanders penalty kill that had been among the best in the league has … stayed among the best in the league.

Andy Greene missed his second straight game, though he did participate in warmups.

Robin Salo was sent down to AHL Bridgeport after an emergency recall.