Hi Jack, welcome to the forum. The tanks in the photos are two different types. The first (9907) is a Mk V* while the tank in the second photo is a Mk IV.
Can't tell you which US unit 9907 was in. I'd like to know myself. All I know is that it left Birmingham (Britain) on 2 August 1918 and was shipped to the USA from Liverpool two days later.
Phil, 1. I suspect the guy leaping out of the car is a humourous touch. There's a few shots of cars being demolished by tanks; maybe the photgrapher had them in mind when doing this shot. Neither vehicle seems to be moving. 2. The markings look, to me, to be red, white, blue, left to right.