I noticed this as well with some belt pouches and asked Kifaru. They said their fabric vendor had some color calibration issues and this different hue is the result of that.
I asked them if they will get the original Ranger Green (the earthy green OP mentioned) back and they said yes, but not until they use up the current batch of fabric. They said there’s quite a lot of the current batch left so they couldnt say when.
I’m so OCD about matching Ranger Green that I am gonna wait especially since I don’t have a pressing need for the pouches.