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Vallejo Field Blue and Grey Blue are usually the go-tos for most people for late war (the darker blue in the first image paired with the red trousers is a completely different color and was really only used in the early war period), usually involves a bit of mixing and layering, vallejo pastel blue is a good highlight if you don't want to mix (or a decent base layer if you want something more vibrant).

This is probably my favorite go at it (scroll down to the bottom comment for tutorial): https://jacksarge.blogspot.com/2016/04/more-boys-in-horizon-blueplus-some.html

Never used them, but AK also makes this: https://ak-interactive.com/product/wwi-french-uniform-colors/?force_isolation=true

So it looks like you would want the colors "FRENCH GREYISH BLUE", and "SPECTRUM BLUE – STANDARD"