Am I, as an investor, exposed to different borrowers in each investment opportunity?

It varies from case to case, depending on the loan type and/or lending company. For example, for consumer loans via the lending company SBL Finance, it is common to only be exposed to one investment per borrower, but for factoring from the same lending company, the same borrowing company can use the service several times. In general, it depends on the underlying securities of each specific loan.