Hi Carl!
I got weights in grams (!) for two rod series. I believe, Blue is about same weight as Greenline, Black is just some grams lighter, and Yellow just some grams heavier than Blue - but I´m not 100% on this.
I think you can do straight conversion to grains with Google, try "grams to grains".
Grey 13´/ 9 and 14´/ 9 seem to be almost same weight - maybe there is bigger difference in cork-handle´s weight (in 14-footer handle is longer in both Blues and Greys).
Rod lenght line rodweight
Loop Blue 11,´6´´ 8 175 grams
Loop Blue 12´4´´ 8 185 grams
Loop Blue 13´2´´ 9 215 grams
Loop Blue 14´ 9 240 grams
Loop Blue 15´ 10 285 grams
Loop Grey 12´ 8 190 grams
Loop Grey 13´ 9 247 grams
Loop Grey 14´ 9 249 grams
Loop Grey 15´ 10 265 grams
Loop Grey 16´ 11 302 grams
Best wishes
FinnSpey