Hey harmy,
I am half way through the work print. at about 1:04:22
I've noticed a few color differences between the gout and workprint. However they are really minor and you wouldn't notice them unless you had the gout on the same screen ;-). and even between official versions of ROTJ there were minor color differences.
I can point them out if you like but it really doesn't effect my experience of this masterpiece.
however i did notice that at 53:51 when the rebel group first lands on endor that the sky is completely different in the gout. either that or it's just much brighter in the workprint
that is very minor though.