Ultimately it's all down to the definition of "hard". I don't really think 20ish km 7% ish climbs where the last 5km average 10% aren't that rare or unique, they're just almost always passes. In fact, Col de la Loze is a pass and would much better be used as such. In the Tour, at the very least I think the Agnello east side is significantly harder, primarily because the first part of the Loze isn' hard enough to drill it completely and you're automatically left waiting until the final 5km, while the Agnello has like 9km of 10% between 1800m and 2700m of altitude.
I think Lago Serru is the closest comparison in the Giro, (if they go all the way to the top it's clearly harder/more decisive), and for the Vuelta I think it's Bola del Mundo and Cuitu Negru. Bola I don't remember if they actually did the hard side of Navacerrada or not, and Cuitu Negru, while lower, is also way, way steeper in the end.
Also, the good old 'you think you know better than that former pro?'. The answer for me is typically yes.