Josh Hart used most of his answer to joke around, but it revealed something important. He spent the second half of the Knicks’ first-round series win over the Hawks guarding CJ McCollum . It was that change — having Hart rather than Jalen Brunson guard McCollum — that completely stymied McCollum and helped change the course of the series. Now, the Knicks must deal with two dynamic 76ers guards: Tyrese Maxey and VJ Edgecombe. What’s the key to containing them? “Probably just asking Tyrese to slow down a little bit,” Hart said after practice Sunday. “That’d be nice. The style defensively is gonna be totally different. CJ, he doesn’t have that quick acceleration at his old age, so you can be a little bit more physical with him. He’s an Unc. Tyrese and Edgecombe, they’re on the young side. They’re quick, they’re explosive, so there’s definitely a different style of defense. Gonna tell them to slow down a little bit so I can get my hands on them and be physical.…