
Are the following mentions coreferent?:
<m> announce </m> in Apple unveils latest MacBook Pros, iOS 6 for iPhone and iPad June 11, 2012. After a witty intro by Siri herself, Apple CEO Tim Cook took the stage in San Francisco to welcome developers and announce new stuff. 
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<m> announcement </m> in Today may be Apple's last Macworld Expo appearance but Apple came bearing gifts. Apple's first hardware announcement at Macworld today introduced the 17 '' MacBook Pro. Built on the precision unibody enclosure, the Pro was launched as the world's thinnest 17 '' notebook, at only 0.98 inches thick, and also the world's lightest, weighing in at 6.6 pounds. 