@Bloodnose
I suppose the artist made a mistake then on page 3.
Other than the hair color, we can identify who is who with the buckle on the sash/belt...
More precisely, the side of the scar on the face.
Normally, if the scar is on the left (from a perspective of someone else), it's Inazuma.
But here on page 3, the scar is on the right (again from a perspective of someone else) which is supposed to be Ikazuchi while the brighter (monochrome) hair color indicate that this is Inazuma.
You can see the comparison on the last page of the previous chapter about the buckle.