I think Fedecan donations go toward shared infrastructure expenses and projects, while sh.itjust.works donations go toward SJW expenses exclusively.
sh.itjust.works donations would go toward shared ~~experiences~~ expenses to some extent, but not other Fedecan projects.
I'm not part of the project though, that's just my interpretation.
"Experiences" was a typo, I meant "Expenses". I think this is more of a roomate situation, where rent and utilities are shared, but food, taxes, and recreation are not. Paying more of the rent may indirectly allow your roommate to spend more on streaming services, you're not ever paying for their subscriptions directly.
That said, official clarification is definitely a good thing.