It’s a bit similar. However this goes a bit further than I understand those projects do. They’re creating a game like the original. With this decompilation project, if you use the N64 compiler you will get a ROM which is 100% identical to the original.
It’s a good game. Just don’t take the content warning at the start lightly. I’ve tried to finish it twice but haven’t been able to get more than a couple of hours in.