I am not an attorney and this is not legal advice. Yes. The selling broker can ask if it is related to the same transaction. I donâ€™t believe the lender or the buyer have to provide the information. However, it may be a term or condition for the purchase agreement and is a negotiable issue. The information in the second purchase agreement should only be shared with approval of the parties to that transaction.
If the request is not related to the primary transaction and somehow the selling broker knows the buyers lender is working on another unrelated transaction but the information would benefit the selling broker in the unrelated transaction, it would be unethical for the selling broker to ask and highly unlikely for confidentiality reasons the lender would provide the information.