Nope.
Every now and then DPD adds new features that require that we update the URL format for DPD buttons and links.
However, we always maintain backwards compatibility with old URL formats for existing products, so any already installed button codes and links will continue to work. The old URLs will simply redirect to the new URLs when they get to DPD and you don't have to update any code you've already placed on your web pages.
Just use the new URL format, as generated by DPD, for any new products to take advantage of any new features and options we may have included.