
Are the following mentions coreferent?:
<m> replacing </m> in On Saturday, the 26-year-old was handed the keys to the Tardis when he was unveiled as the 11th Doctor Who, replacing David Tennant, who steps down later this year. 
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<m> take over </m> in The BBC says little-known actor Matt Smith will take over the title role in the long-running sci-fi series Doctor Who. 