You cannot know this unless you are read in to both programs, so this is further speculation. And if you were read into both programs (or either one) you wouldn't say things like this.
"To achieve lower costs the JSF accepts notable aft sector stealth limitations, especially when tackling deep or layered air defences with fighter threats - an acceptable tradeoff for shallow littoral and FEBA area battlefield strikes against predominantly short range mobile air defence systems. The aim in the JSF is to use newer materials technology than the F-22A does to reduce stealth costs, although we are likely to see this technology migrate across to the F-22A in later blocks."
http://www.ausairpower.net/APA-JSF-Analysis.html