I'll try my hand at giving two points of comparison and contrast between William Shakespeare's sonnets 116 and 130.
1. Beauty and love are more that "rosy lips and cheeks": Both poems seems to be concerned primarily with arguing that true beauty and true love are not superficial and changing.
2. Truth and untruth: The closing couplet in both sonnets sets up an opposition between truth and untruth. Sonnet 116 ends with the following statement:
If this be error and upon me proved,
I never writ, nor no man ever loved.
Sonnet 130 ends with a similar statement:
And yet by heaven, I think my love as rare,
As any she belied with false compare.
Because both sonnets seem to be concerned primarily with establishing the truth about their subject (what is beauty and what is love), we can understand why both poems would end by emphasizing the different between what is true and what isn't.