Dealing with color variations through our online medium is fraught with all sorts of difficulties.
But let's take one of the two stamps you have pointed out, the 2 cent stamp to the upper right of your 3 cent stamp. Where Washington is in a shield-like frame.
That would be a US Scott 319. That issue alone has a few shade variants, which some people can see and others have trouble with some of the more subtle gradations. It would be tough to go any further on the basis of the current scan/photo. It looks to me like like a run-of-the-mill 319 carmine. Sure doesn't look like lake. there are scarlet and carmine rose varieties, too. But making those shade determinations online is problemmatic.
Edited to add that those color variations in the 319 of which I wrote above were in the original inks used during the printing of the millions upon millions of these stamps. And once a stamp is out in the wild, subjected to all sorts of environmental conditions, then you can get color shifts from UV exposure, as you mention, or various chemicals in the atmosphere.
There are at least 5 noncoil stamps of that design. They are separated by printing method(flat plate vs rotary) and perforations (11, 10, 11x10, 11x10-1/2). Most of these stamps are carmine in color. One stamp, Scott 634 (rotary press perf 11x10-1/2) has two shades, carmine and carmine lake. Much more likely that the stamp to the right of the 3c Washington is just faded. I do believe it is a different stamp than the one above the 3c, but this is because of a different perforation number.
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