First, anyone can post their opinion on this.
Does the application date for HMDA LAR need to match up with how we tie in the application date for RESPA / Reg Z and Reg B?
Yes, it should. It sounds like you had a new application for product B (or at least a counter-offer). Therefore, I would have a new application date. However, it really depends on what changed. For instance, if you went from a 2nd market loan to an in house loan (or from a closed-end to an open-end loan), I think you have a new application (new disclosures are triggered too). If you went from a 5 year loan to a 6 year loan, I don't think you have a new application.
Maybe you can provide some specifics so we can provide a better answer.
From the other regs position, I have trained my bankers to give the at application / early disclosures at the front end and if it changes significantly (i.e., different product), they should give another set of disclosures. However, I have taken the position that the follow up set of disclosures is not required but good practice. I'm not feeling quite as positive about that position anymore.
I agree. If you have a new application, you need new disclosures. If something is "tweaked" (term, loan amount, etc.), then new disclosures are not required.