Duo-toned field of fireweed in eastern Alaska

I was driving from Fairbanks to Tok this past Saturday and did a double-take as I passed a field of fireweed. Were there two colors of fireweed?

Fireweed (Epilobium angustifolium), can range in color from pink to rose to magenta, depending on soil and growing conditions, but I have never seen two different colors of fireweed in the same location–until now.