If you go to the Parish page for Illogan:
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and scroll down to the Wills section, you will find both grants of probate have been transcribed.
The first, listed as "Clement UREN", is the grant of 10 July 1747.
The second, listed as "Clement UREN, other copy void", is the grant of probate from 30 Sept 1754.
From a quick read, it seems the original executor died, so the will was proved again.