Granville Sharp's rule states that when a clause has two nouns (or other substantive) in the same case, connected by a copulative kai ("and"), that are not proper nouns (i.e. not someone's name), which describe a person, and the first noun has the definite article while the second does not, both nouns are describing the same person. If one or more of the nouns is plural in number, this may not apply but can.
13 looking for the blessed hope and glorious appearing of our great God and Savior Jesus Christ,
1...To those who have obtained like precious faith with us by the righteousness of our God and Savior Jesus Christ:
Is the Granville Sharp Rule in effect in these verses? What evidence supports and/or refutes the use of this rule as applied to the similar clause in both of these texts?