What version of this tune are you currently on?
I see that the tune available for my (and MFNTBRO) ID is 1.00. I don't know if this is reflective of what you have worked out with Nathan to date, if so, but your ID is different, then I wonder if it would make sense to use the same version number so it is based on the tune itself, not just which is first for that ID.
Basically what I am trying to say, is if the actual tune parameters are equivalent across the different ID's they should have the same version. If your current version is say 1.02, then the one for my ID based on the same parameters should also be 1.02. This allows customers to compare the tune itself regardless of the ID.
Now, the notion of the ID may be much more complex, I don't know exactly what the different ID's across the same model vehicles represent.