Well, I can't speak for the Case write up, but I can say a few things about the John Deere write up.
First, the article makes it almost sound like the 1966 and 1967 112 round fender was available with the standard Kohler motor, or you could elect to go with the optional Tecumseh motor. The 112 round fenders were only available with the Tecumseh motor. The other thing I noticed is, they claim the 112's were available with hydrostatic drive. Not true, as neither the 110 nor the 112 were available with this option. The other thing I read is, they claim the 112's only had Kohler motors after 1969, wrong again. The Tecumseh motors were available up until 1971 for these tractors.
As for the 140, yes it was introduced in 1968 as claimed, and yes it is still one of the most desirable tractors that John Deere has made. However, when the write up talks about the color options, or better know as the Patio Series, it claims that the multiple colors were only available for one year. These color options were in fact available for 2 1/2 years, 1969 through half production year of 1971. It is believed but not 100% proven, that John Deere started making the Patio Series tractors in late 1968, but wasn't officially introduced to the public until 1969. The write up claims that the hoods were available in four color options, which is correct, however there were seats that were available in the same color options as well, but there is no mention of the seats at all.
Not knowing just how old this article is, the only other thing that I can point out would be the statement, "Most parts can still be obtained at your local dealer". If this article has been written within the past five years, then the writer hasn't gone shopping for parts at his local dealership.