PILOTGel Ink Refills for FriXion Erasable Gel Ink Pen, Fine Point, Blue Ink, 3 Packs 9 refills total

Are these refills for the dark or light blue pens? I have the set and use the darker blue (which to me is a true blue on paper).

Will this fit in the multi color pen?

It this the .5 or .7 and what is the difference I like really thin lines and I want to get the pens but only if I can find the refills?

Could these fit in the pilot mr animal collection metropolitan pen? (they take g2 refills)