What is difference w/Kompare & KDiff3

Hey! Whats the difference with these 2 apps? They both look like they do the same thing. Is 1 newer than the other and maybe a replacement for the older one or am I wrong and they are used for different things? Any details will help me, I’m hoping one might be a replacement for the other and include some new features so I can only install 1 of them but if they do different things I’ll install both if needed no problem. Thanks for help!!