11i Revenue Accrual Exchange Rate vs R12

In 11i, does Oracle projects select the revenue projects functional exchange rate date differently than R12?  I am working in an 11i instance (only access to PROD) and I am observing that the rate date is usually the week ending, except when supplier invoices, then even if the supplier invoice date falls on a week ending, in one case I found it used the following week ending date (but always a weekending).

Whereas in r12, I find it uses the accrue through date at all times, and the original when re-generating per the profile option to control this.

Thanks in advance.