For the underside shot, seems that the green stripes on yours and mine shot turns out "yellowish" on my screen. Below another example. Was it because we had flashed at it directly ?
Chng,

Ellen and me had the same effect too last year .

I guess it depends on the direction of the light and the viewing ankle. See attached photo. The same butterfly shows two diff colors
Loke you are right , yes the angle of incidence of the flash on the wing affects the color of the green of the RB register on the sensor. What I eventually did was either switch off the flash or tilt the flash slightly to the side in order to get the true green as seen by the naked eyes.