I'd agree about trying a mix, but as they are, either would pass, allowing for fading, original paint batches etc, with the XF-14 probably being closer.
Good work so far, and the F3 kit has transparent engine covers - love 'em or hate 'em !
Is the paint for the thumb, or the plane? If for the thumb, I'd try a red really, if for the plane, I'd agree with a mix, just a bit darker of the JA Grey. But you could use like a lime green on the thumb, I've seen it work before.
After the Marauder, this is a breeze. I'm going to try, in future GBs, to do a fall together kit as my first project and then one requires work as the second, hoping the first will take a month with plenty of time left for the second. Anyhoo....I was hoping to get the green sections done before the camp bus this afternoon but I had to do some touch-ups on the grey just now. Glued and painted the landing gear. Tamiya's way of dealing with this is to glue the gear together and then slot the finished wheels, in to be held in place by two nubs. We shall see.