FWIW,
Here is a service manual for a sundstrand hydro unit.-- dated 1974
As most know, it is used by other color vehicles as well as tractors mowers Etc.
pg 10 lists various oils compatable
http://www.cushmantrackster.com/pay-pdfs/sundstrand.pdf.
Deere of course says there oil is better, cub says there oil is better and the war is on.
I personally have been using neither of those oils for just over 33 years in my big IH tractors and yes Green ones also, with no problems. but that is just my choice.
One might find some useful information in this old manual.