Oh actually this does not work on our case. This Sync tasks between projects - #2 by Arthur_BEGOU makes use of one task in two projects. Meanwhile, our use case has 2 different tasks, one on each separate project.
Task A is in Project X and Task B is Project Y. But Task A and B has to be interlinked in such way that while Task B moves through columns/changes status in Project Y, Task A also moves along columns/changes status in Project X.
I hope there’s a way to do this.