The lower two in the first pic, with the pantalon rouge, are not 'horizon blue' as in the second pic. The adoption of bleu horizon was in 1915 and corresponds with abandoning the red trousers.
VMC Pastel Blue is a very close match for that second pic. I also have VMC Blue Grey and it's close, but a bit lighter and doesn't have that tiny tinge of purple. Here's an example- Blue Grey, highlighted Pale Greyblue, washed black:
Of course keep in mind that
IRL, the color of cloth varied considerably from batch to batch and bleached from exposure to sunlight, so there's a fair bit of variance even on real examples.