The color of the wire is a convention. I don’t believe it is mandated by code, although I’m not a licensed electrician. In general with a split-phase panel, two adjacent full size breakers are different legs of the split-phase. The question with the breaker in the top left is whether they are the two wires of a 240V circuit or two independent 120V circuits. The breaker switches are ganged, indicating they are a single 240V circuit, but the two wires are not only the same color, one appears to be a different type than the other.
In either case, it’s safe to say you can measure it with two CTs. If they do indeed go to the same 240V appliance with no neutral, which I doubt, then you can use one CT and “double”, or pass both wires through one CT with one going in the opposite direction.