Originally Posted by Check Essential

OK. I get it now.
Excellent question. Gotta admit, that's a new one for me.
Might wanna run it by Geordi Leforge, but here's my sea lawyer answer. Unofficial of course:

Scheduling has to follow the open time award sequence contained in the contract. It says open time WILL be covered under Sections 23.N and 23.O. There is no exception for pilots on assigned rest.
23.M.7 says they can deviate from that only to "maintain schedule integrity". But if they do that, then the guy who was supposed to get the trip is pay protected.

Bottom line -
If you are legal for the trip, you get it. So yes, the yellow or green would trump the assigned rest.
If it were otherwise, then skeds could easily violate seniority in the trip awards by just assigning "rest" to one guy and giving the nice greenie to the next guy.