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While that site was pretty good, it did have missing data elements. When I looked up my cars, my 87 did not appear at all, my old '92 had some missing options, and my '02 had one missing item. My Silervado also did not appear at all.
The item you get from the NCM are copies of the documents that came with the car. The Build Sheet is what the assembly line workers used to assemble the car and includes dates. The window sticker has the MSRP of the vehicle, including all the options by package. It also includes the name of the selling dealer. Compnine didn't provide that.
And if you join the NCM (see this sticky where you can join for a 25% discount), you can then order the build sheet and window sticker at the Member price. And the membership dues are fully tax deductible as a charitable contribution