Unless you are using the same EXACT .MDW file, you can't do this very easily. The ID number that is one of the things you can set in the User and Group Accounts Dialog Box is used as a key/tag for the permission. If you change .MDW files, you also have to back-convert the security info to use names except for the actual permissions mask.
However, the Users and Groups collections appended to each securable object can be enumerated in a For Each xxxx in yyyy loop to include a name for the user or group ( xxx.name works ) and the permission codes can be copied as a LONG. You would have to figure out the format for transmitting this information, perhaps in a temp table, but then you could try imposing the same LONG value on the destination by object name and user or group name. I believe .AddNew works in those collections, too.