It is a question of princips…
If you want to be clear with your clients or engineers, IMHO you MUST change the name of the file and put an indice —it is better with a description of the changes— at each "external" diffusions.
With this practice, you can call your partner and speak about of the "F" or the "G" version of your project and speak of the same things.
You can also create an historic of your diffusions —if necessary…—
If you want to be "chic" you can also archiv the ArchiCAD file "origin" of your indice. You can then recreate another particular diffusion of your indice.