Not exactly, I'm affraid. There are no details about costs of building, only one big price for each big centre. Cost of freestyle and snowboarding park is "only" 16,7 million $, but it is not cost of building it, just improvment. What was improve? Almost everything or maybe just infrastructure (more parking slots or better capacity)? No idea. And let's not forget that in Vancouver there was 5 from 7 venues that we need today (there was no slopestyle and big air). I wanted to compare this sum with two most expensive venues, as I assumed - ski jumping hill and sliding track. Unfortunately couldn't find cost of hill because there was only cost of biathlon/cross-country/ski jumping/nordic combined centre, which is 119,7 million $ for building it (not improve). In turn whole sliding centre cost 104,9 million $, also build with whole infrastructure of course. Couldn't find any cost of building venues in Sochi and SLC documents (maybe I just don't know where to look ) and don't speak Italian so couldn't check Torino so in this point my searching is over.
Summarizing. I think I am convinced that building freestyle/snowboarding centre is cheaper than sliding track or ski jumping hill but still not sure how big is the difference.