I've only ridden it slowly, not racing, but Passo del Pura is not real hard. From the Ampezzo side, it gains about 870 meters in 12km, median gradient 7.4%, max 13%. From the Lago di Sauris side, it climbs 447 meters in <7km, median grade 8%, max 10%.
Sella di Razzo is a bit longer but not...