RTP describes the share a game is designed to return over time; the house edge...

https://www.cool-bookmarks.win/rtp-is-a-game-s-long-run-return-the-house-edge-is-the-casino-s-average-share

RTP describes the share a game is designed to return over time; the house edge is the share it retains. A 96% RTP means a 4% house edge