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1 other difference also between the 2 species, at the same time (12 juni) Picea jezoensis have finished the growth and Picea bicolor start only.

The section needles of bicolor are a square, for Picea jezoensis it's a flat needles
The cone of bicolor are strong like Picea abies,
The cone of jezoensis are soft like Picea pungens.

Picea jezoensis have some cultivars : Aurea, Nana Kalous, Hroch, Howell's Dwarf = Howell's Dwarf Tigertail,.Yatsubusa if not = to Howell's Dwarf ?
Picea bicolor have only 2 cultivars : Prostrata and Bruj (If it's correct for Bruj, I don't well know) and now a WB I found named Joyau

Chinese Marl, Chitosemaru, D.J. Broom, Yosawa are a cultivar of Picea glehnii.