I'm still having trouble taking true-to-life photos of the blues together. They are subtly different, and I'm not a good enough photographer to capture the nuance. (I welcome all suggestions to help me improve!)
Nordic is more of a Navy color, but the white grid really lightens the effect. "Midnight tone" is a perfect way to say it. It doesn't match exactly with any of the other blues. Sapphire Dyneema is a bright clear blue that doesn't have the depth of Nordic. They don't look quite right next to each other; they are just a little too alike and a little too unalike to either match or coordinate. The same is true of Sapphire Cordura. Nordic makes Storm look pale and washed out. I'm still on the fence about Indigo. Indigo, to me, looks like there is more than just blue in the fabric. (I think that's a property of Ballistic rather than Indigo, but I don't have enough Ballistic to say that with utmost confidence.) If you had Indigo bags and wanted Nordic ones to add variety to a matching set, it will do but Nordic doesn't look like Indigo with a white grid.
Nordic is AMAZING next to all the other Dyneema colors. I happen to have an Iberian pouch with me today. The two together remind me of the FoJ pouch. Here's a substandard but hopefully adequate photo:
Attachment 2859
I agree with @moriond's description of the texture and weight of the two fabrics. They are both light and flexible, but you could wad up a 200 Dyneema bag and that's a bit harder to do with the 400.
I just can't say enough good things about Nordic. It's awesome. I can't wait for my Co-Pilot to arrive, and I look forward to Nordic/Wasabi combinations when the new shipment of fabric arrives.