Recently, Apple has made some very noticeable changes to the color scheme of their products. Specifically, the Gold and Space Grey.
iPad 9.7-inch models prior to 2018 were made in a more traditional "Gold" color with a standard shade of yellow.
In 2018 Apple discontinued their "Rose Gold" color to redesign their "Gold" color scheme. The Gold color for most recent iPad 9.7 now carries a pinkish tone as opposed to a yellow tone.
As these color changes have been repeated on other newly released iPad's, Brydge has followed this color change, to match their new colors/tones.