>Quick correction however, what I meant was that the file size on disk differs in the new environment and that doing a CRC32 on a file size which is different from one environment to another, for the same file, will thus create a different CRC32.

That sounds familiar, but I cannot put my finger on the exact item. Must have encountered it when we added linux-based NAS in our environment, but as further problems did not materialize set not up permanent store in grey matter ;-)