Strange how they are both 79KB.
I think that part of the reason is ccleaner is dumb, since the folder locations are the same how does it determine which are 6, 7 or 8 or 9 for that matter (when they include avast 9).
Open the entry to see the details and post the full paths and files ?
Best course of action - Personally I wouldn't allow ccleaner to delete anything related to avast! even if these are logs the contents may be beneficial to the developers should you experience any problems.