
Are the following mentions coreferent?:
<m> announcements </m> in While Apple's final keynote address at the annual MacWorld convention in San Francisco didn't contain the iPhone-related announcements many had hoped for, we were given all of the details on Apple's latest revamp to their largest and most powerful MacBook Pro. 
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<m> announced </m> in Apple's big announcement at Macworld yesterday was not a new iMac, Mini or netbook, all of which had been rumoured, but a battery. The firm announced a widely expected refresh of its 17in MacBook Pro, with a battery that the firm said will offer eight hours of operation. 