I checked the Tousley site and same part numbers for 2013 GT and 2013 Boss 302. Similar numbers also at my dealer's Ford Parts website. So I believe they are the same.
They are different part numbers. Try the Levittown repair parts site.
BR3Z7B546AE is for the 2013 GT CR3Z7B546C is for the Boss 302
It wasn't an uncommon swap when the Boss 302 first came out. Clutches bolt up to 2012-up GTs without modification but the 2011s require the 2012-up flywheel.