CSM image change on hover

Hi, so im typing to create a website that works like this: https://public-library.org where you hover over a project and that image appears. I have gotten as far as to make a CMS image appear and disappear on hover, but it shows the exact same image everytime. I tried to use this project (Webflow - Lunneryd Arkitekter) as a basis but even after a thorough investigation, I can’t seem to figure it out. Any help would be much appreciated. Here is a link to my project. Cheers !