VCM enhancments settings

I'm working on a 2002 GMC k2500HD 8.1L we installed an STS turbo kit on it a few years ago but now he is taking the kit off to put on a newer truck. I'm trying to put the tune back to stock and don't have the "stock" tune saved anywhere not expecting I'd ever have to do this. So a few questions.

I had tuned this truck by converting the VCM Enhancements to 2bar speed density. Do I have to use credits to convert back to the 1bar MAP-speed density Enhanced?

Or a better question might be..... can I just hook up my Pass through stock style programmer up and reflash the PCM with the latest and greatest 8.1L GM stock software and call it good? Or will I need to "un-do" all the HpTuners programming on the VCM editor first? Or what would you guys suggest to make this as simple as possible?

Thanks

Just have the latest GM published cal by VIN put into it.
Save the cal that came out before you over write it. Just in case.