Once upon a time (long long time) ago, I had an L-permit in ZH.
I was then offered a job (longer term B-Permit) in Kanton AG.
I had to depart CH for at least 90days before I can re-enter (apply) for the B-Permit.
However, the HR was confident (and it was so) that ZH and AG authorities do not exchange details about permit-holders. I returned after only 3 weeks.
So, you can take a risk and return earlier, if you are not in the same Kanton.
If you are, then you should stick to the rules. Being banned from a forum is one thing, being banned from Switzerland is not funny.