You've noticed a little wrongly in the specifics you mention, but it's true there are differences between the two. The reason being is two-fold.
Firstly the 10 band Graphic Equaliser EQ is 1.5yrs older than the other one, and the measurement is a bit different.....Oratory often measures more units of the same headphone and then updates the average measurement curve upon which the EQ is based, and if you look in the following two pdf files you'll find that this average measurement curve is different for both, he's not updated the measurement for the Graphic Equaliser EQ:
https://www.dropbox.com/s/gwxt4qup0o6udvz/Sennheiser HD650 (10 Band Graphic EQ).pdf?dl=0
https://www.dropbox.com/s/zr5tqw0qojom9uh/Sennheiser HD650.pdf?dl=0
Secondly you'll notice that Oratory has chosen to align the measurements slightly differently on the Target Curve, with the Graphic Equaliser EQ measurement being aligned with the Target at 1kHz and in the other one you'll notice that the measurement at 1kHz is about 1dB above the Target Curve in terms of how he placed the measurement on the Target before applying EQ, which will effect how much & which parts of the curve are boosted or cut. It doesn't really matter much regarding where you the align the measurement on the Target Curve (as it's all relative) as the same result can be obtained in the tonality and general accuracy to the curve, but aligning the measurement optimally on the Target Curve can mean it can be slightly easier to EQ to the Target, perhaps using less filters, and I find it can make EQ'ing +10kHz more reliable if you choose wisely because if you place it optimally on the Target Curve from that perspective so that it aligns up nicely with the treble then often times +10kHz will be in the right ballpark area of energy without the need for any use of High Shelf Filters on the 10kHz+ area. For my EQ's that I create (based on Oratory/Crinacle's measurements) I try to align in the most efficient way, and that's often aligning at 1kHz, but sometimes small variations up or down based on what looks right & easy when I line it all up.