"from another s-corporation owned by the same individual"

What you have is a Shareholder. S Corps don't have "owners" per se. It would also matter if this is the Sole Shareholder for each entity, and the type of "at risk" losses from that other S corp.

What needs to be determined if you are asking about 1120S or 1040, really. That's why it's important to know if the lender is the Person or the S Corp. Because the person can have lent funds personally that they took as a distribution or a loan from the S Corp to fund that lending. This all matters.