The old and the new form got the same information. Few years back, in 2013 FSW application, a revised form was added at the last day with probably with only one new added information with the form. So they reject the application.
For PGP 2016, as both the forms contain the same information, logically it should be accepted. If you want, you can sent the new form with an explanation in case they reject old form and ready to add new docs. From my experience in FSW2104, many applicants missed forms/certificates with original application and later on sent addendum. The addendum was accepted. So you can try sending an addendum.