Well, the Heat poster is not worth much to begin with, so if it is undersized, I'd say get another one.
The Clockwork Orange will retain some value, since the main art hasn't been touched. Some collectors won't touch it, but others who can't afford the 30x40 original might be interested if only to own the design.
I really don't know the value of posters, since I'm not a seller and just collect to own. Others might chime in. I'm still concerned about the fact that it is rolled, but if it is authentic, it might be worst $200-300. Again, pricing is not my thing.
T