I don't know for sure if these parts are factory seconds, but I'm fairly certain they are the same part.
I did some searches on TRW and they are legit company
http://www.trw.com/who_we_are
TRW Automotive is among the world's largest automotive suppliers and is one of the top financial performers in the industry, with 2011 sales of $16.2 billion. We are passionate about delivering the safety that everyone deserves.
supplies more than 40 major vehicle manufacturers and 250 nameplates
holds leading positions in all of its primary product categories
I don't think a company raking in $16.2 billion in a single year is going to shaft us with factory seconds. Just my 5 cents.