[Paint] How close is Castellan Green to Waaagh! Flesh?

I'm painting two side-by-side Cadian Troopers in craftsmart PRT Vs. Citadel and I just noticed I don't actually have Castellan Green >.>

Admittedly, I could use any colour I want, but then I got curious when I looked at the two colours on the comparison chart - I can't pick up on the difference between Castellan Green and Waaaaagh! Flesh, at least online.