The HiTech Creation's web page charts appear to be the same charts as those available in game - at least for the P-51D, the curves were a perfect match. It seems likely that HTC would have used the same charts in both places, though the tested aircraft weights are not listed on the web page charts. The few weights I spot checked match hangar weights for 100% internal fuel for different aircraft.
DokGonzo's stuff is terrific, including far more than climb rates and max speeds, however I can't find any weights listed - did they test with a fuel tank or a typical combat load of 50%? Was fuel burn rate set to 0? Can't say for sure for this page, and the rest of the site "Netaces.org" seems to be gone. I'm glad this page is still up though, it is very nicely done.