When you try to apply a Sysdiff snapshot, you receive:
A snapshot or diff file specified on the command line was created with a different user and cannot be used now.
This error occurs because you are NOT logged on as the user who created the snapshot.
To apply the snapshot when you are NOT logged on as the user who created the snapshot:
sysdiff /apply /m \[/log: log_file\] difference_file
where the /m switch causes the file changes to be mapped to the default user profile, instead of the profile for the creating user.