the big difference between the two stories are the settings. In Shakespeare's text the setting in the summer," shall I compare thee to a summer day" said Shakespeare. " one day I wrote her name upon the strand, but came the waves and washèd it away," said spencer.
In Shakespeare prom he is talking to a girl. In Spencer's he is talking to a girl but she is also a character and speaks.
the theme for both is that love should last forever Even after death. In Spenser's text he says " our love shall live, and later life renew. In Shakespeare's
text he says "so long as men can breathe or eyes can see, so long lives this and this gives life to thee.
In conclusion that's how the texts are similar and different in the setting narrator and theme in these two passages.