Peter Beales refused to accept several errors, this one included. Yes, Spray Cecile Brunner is a different rose from Cecile Brunner -- it's a sport of the latter, just as Climbing Cecile Brunner is a sport. They were tested and found to be genetically indistinguishable. Similarly, Old Blush and Archduke Charles are different roses, but the latter is a sport of the former, so genetically they are virtually identical.

What was found in California matches old photos and descriptions, and I think Malcolm Manners included it in a "paternity test" to see if it matched up to its purported parents, but I don't know if the results were published yet.

Three different roses.
The original Bloomfield Abundance was a Wichurana x Hybrid Tea. It was rediscovered in the US by Judy Dean in 2012, and identified by Fred Boutin. See Kim Rupert's photos.

Almost immediately, judging by the references, what is now known as Spray Cecile Brunner was mislabelled and distributed as Bloomfield Abundance, and the error was perpetuated in one of Graham Thomas's rose books.
Genetic testing is consistent with its being a sport of Mlle Cecile Brunner. As you note with your plant, it flowers later, has long foliaceous sepals, and grows much bigger.
So your photo belongs in the Spray Cecile Brunner file.