That monogram is very close but I would not assume they are from the same place even if they were exact. I think you are in the right place for sharing, linking with others, and considering the known facts. For this particular comparison,
I'd like to see a larger plaque from the pearl series where the name is written out. They must have existed. With that
many pieces made with smaller denominations, you can bet they had larger plaques with exact identifiers included.
Don't get frustrated. There are dozens of CM monograms that will likely never be attributed... because different places used the same exact overlapping CM monograms. The letters that are in the CA/AC monogram are typical fonts and are positioned standardly, but at least we have a target to work on now... Keep up the digging!