As of my last knowledge update in January 2022, there is no information about a Canon EOS R6 Mark II or a “4 MEARSACE” model. It’s possible that these products have been released or announced after my last update, or there might be a typo in the information provided.

If these models exist, I recommend checking the official Canon website or reliable sources for the latest and accurate information on the Canon EOS R6 Mark II and “4 MEARSACE” camera body. You can find detailed specifications, features, and any advancements over previous models in the official product descriptions.