How to find exact version of windows installed

the downloaded windows 2003 installation file from MS VL has 'R2' in the file name, but after installation, it shows no 'R2' either in winver or msinfo32.
It says Windows Server 2003 Standard Service Pack 2 and build# is 5.2.3790
I have to make sure the version matches with one I'm doing P2V not to break any application s residing on it. How do I know exactly what's installed. Following is what shows in the new installation:

Version 5.2(Build 3790.srv03_sp2_rtm.070216-1710: Service Pack 2)

And one I believe it's volume licensed shows ;
Version 5.2(Build 3790.srv03_sp2_gdr.070216-1710: Service Pack 2)
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crcsupportAsked:
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crcsupportAuthor Commented:
I ran the script, it says it's R2. So, I guess I don't I have to trust what system properties show or the script says.

Do you know what numbers mean in product id in System Properties xxxxx-yyy-zzzzzzz-zzzzz under 'Registered to:'?

69712-641-zzzzzzz-zzzzz

I think the x part is product type and y part is licensing type. But don't know last two parts, zzzzzzz-zzzzz.
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Chris MillardConnect With a Mentor Commented:
The last part is unique to your system / serial number.
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