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I am looking for one that is close to Ushabti bone Hex code #EFD9A8 I can find similar colors but I am unsure if they can be used in an airbrush, I am still very new to using an airbrush an want to make sure the paint will work without thinning if possible.

Also how are the vallejo washes and are they compatible with an air brush?

If you have Ushabti Bone, just use that.

Thin it with some airbrush thinner/medium and you'll be good to go.

Like previously stated, thin it down to the consistency of milk and shoot it through.

Alternatively you could check out vallejo model air "Sand" or "Light Brown" colours.
I've used them to do deathwing zenithal highlighting with good results.

Not sure where you're located but if you're in a highly humid or tropical area (such as South Florida where I'm from), any range of GW paint that consists mostly of white tends to come out chunky right out of the pot, even if its sealed, so definitely water down your paint with bottled paint medium rather than water. Same thing goes with white or mostly white primers but there isn't much you can do about that other than spray a bit closer. Not sure the science behind why, but it's just a fact of life down here unfortunately.

Always be careful if you're loading your airbrush and just be certain no chunks get in there as it can cause some air flow/blockage issues.