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 too bad- from Lago di Sauris it gains 820 meters in about 18km, 4.5% median grade, max 11%. If they would instead eliminate Passo della Mauria and replace it with the climb from the Piave to Sella di Razzo, it gains 1050 meters in 19.7 km, median grade 6.2%, max 15% (which it touches briefly in the final tornanti).
The little climb from Comeglians to Tualis, then via Solaris to Ravascletto, was included in the 2007 Giro Zoncolan stage won by Stefano Garzelli.