I don't know what the changes will be in different builds. I will now always record a separate back-up. I might also use my RED one as the other recorder if needed; it is a workhorse. I know the RED ONE Audio but I do not know the Epic Audio as much. It has been Mic Level, recent changes to internal limiters. The old RED One might be one of the best on hand 4 channel 48khz audio recorders I have ever had!
Being a big RED One audio user starting with my camera #12. I have only had an issue regarding camera audio with Epic.