I am so intrigued by things like ships being stretched. I hope to cruise on the Enchantment sometime soon.
I have at home with me an old 2004 brochure showing the pre-stretch deck plans; I looked at RCCL.com for the new deck plans. The section of deck 8 that now has the Category D staterooms (aka Superior Ocean View Stateroom) is the new section. Previously, all that was on Deck 8 were Cat Cs, now known as Junior Suites, and better. The detective work gets a little more difficult as you move down to Deck 7 because deck 7 always was Category Ds for the most part. It's hard to tell which ones are the new ones. Most if not all of the staterooms have been renumbered.
Because you have booked a Junior Suite, you will be in one of the original staterooms. I just reread your post; it is possible that the inside stateroom you spoke of may be in the new section. Go take a look at Royal Caribbean's website. Under "Find a Cruise" select "ships", then select the Enchantment, then click on Deck Plans!