I haven't caught up on this thread in awhile, so I apologize if this was said elsewhere regarding accreditation -
Unrelated to the internet, I had this conversation with some people involved in both APEx and ACRO accreditation processes. I'm not familiar with the ACR-specific one (if one exists).
My take away was that ACRO's accreditation is entirely EMR-based, meaning it's just reviewing charts, no site visit or anything (not sure if this is just a COVID thing or if this has always been true). APEx involves "looking" at aspects of the facility (either in-person or, currently, virtual, as far as I can tell).
Though I've been apart of both APEx and ACRO accreditation at different facilities, and this does seem true. I haven't like, independently confirmed this through their official resources. I apologize if this is incorrect.
APEx seems far more rigorous though, having done both.