Just to clarify, you are loading the current checkbox value via get_field, then you want to find all other posts which have exactly the same checkbox values? Or are you finding any posts which have any of the checkbox values ticked?
I think you need to dynamicaly generate the meta_query args array by loop through your checkbox values and appending to the meta_query args array.
Does that help?
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users