Knots is nostr:nprofile1qqs0m40g76hqmwqhhc9hrk3qfxxpsp5k3k9xgk24nsjf7v305u6xffcpy9mhxue69uhhyetvv9ujumr90p5kuem5dahxy6t5vdhkjm3wdaexwtc4n2gjr derivative of Core.

More for advanced users

Pretty sure he maintains it just to have another version of Core running, to make the Bitcoin software stack more resilient. Plus again he has a few more advanced features for power users & devs.

Both talk to the same base layer