Long answer ahead that goes into different details. I have a TLDR at the end though if you aren't interested in reading the different angles and my own analysis.
I know our 2nd D pairing with Skjei and Pesce has been great and I've liked them, and they're a big reason why Carolina's defense has been so great for a while, but since both Skjei and Pesce have expiring contracts in the summer of '24 along with so many other big players on the team (like Aho, Necas, and Jarvis), and are both around 30 years old, I think for the right player, Carolina would consider trading Pesce or Skjei but it'd probably sting them even for an all star forward. It's hard to predict though how much they value them because Dundon has made positives comments about Pesce and Skjei.
KK has really elevated his game this season and isn't quite the bad player non-Carolina fans assume he is. I think he'd normally be off the table, and if we got a new 2C, KK would be put down to the 3rd line. However, Matthews is one of the most elite offensive forwards in the game. So, maybe they consider him for a Matthews tier player.
I think Carolina failing to get other all-star forwards over the past year (since Eichel last season, then Tkachuk during the off season, and then Meier during this year's deadline) shows not only their willingness to target an elite forward, but I think their past failures of getting said type of players recently probably makes them more determined to get a Matthews, a Kyle Connor, a Pettersson, or a Keller to add to our core if the price is tolerable/within reason.
However, perhaps the biggest deciding factor in making a big trade from our roster (with Pesce and KK) is how much does Carolina want to take the next step to winning the Stanley Cup? We've had a good core of players for a while now, but maybe they say screw it, let's finally get that 20 something year old all-star forward we've been wanting for a while now. If Carolina actually, against all odds (it's still a long shot even with powerhouses eliminated), manages to win the cup this year even with all of their injuries? Maybe they aren't as aggressive, or heck, maybe they're really worried about guys being too expensive to re-sign in '24 with so many contracts expiring.
You'd probably be less interested in this, but If we trade both Morrow and Pesce though, our RHD depth is noticeably weaker, and Chatfield clearly would be on the 2nd defensive pairing (which he has shown he's capable of since he filled in for Slavin on the 1st line, but it hurts our depth). Also, Burns has 2 years left on his contract, and he might not sign another contract, but maybe he could still play well for 1 more year with how great he still is late in his career. Point is, Burns, as our 1st pairing RHD, doesn't have many years left to play and thus his retirement will hurt our RHD depth even further.
TLDR: Carolina might consider trading those roster players to finally get the 20 something year old all-star forward they've been trying to add to our core to help push them to win the cup.