Please notice that the Fast Simon plugin stores a unique account identifier in the WordPress database. If you are copying an entire WordPress server snapshot with Fast Simon plugin it will also include this unique identifier. This will mix between the two sites products and should be avoided.
To best address this issue:
1. (best approach) do not include the Fast Simon plugin code within your WordPress snapshot. Install the plugin post the copying to the new server
2. In case that the WordPress snapshot contains the Fast Simon plugin, following the copy of the snapshot: Deactivate the plugin, Delete the the plugin and then install the plugin.