This comparison is so grossly inaccurate that the comment from 'Tidux' should be completely ignored and scrubbed off of the NeoGAF forums.
Further research from 'n4g.com' tells me that at least one of these data points were sourced from 'VG Chartz."
http://n4g.com/news/1607545/forza-horizon-2-sells-366k-first-week-xbox-one-sales-up-25
I hope members of these forums don't trust these sorts of websites that prey off of unsuspecting users who are desperate for any sort of data.
As intelligent members like CosmicQueso have previously alluded to, sites such as ********.com and SuperData largely rely on conjecture and guessing and thus should not be trusted.