UG Personal StatementWatch this thread
Need more help on going postgrad?
If it was relevant for UG is it really relevant for PG? If it is, re-write it rather than just copy. And you are mistaken - copying your own work can be plagiarism.
And I am aware of self-plagiarism, it's just that I read (some time ago) that for uni applications when they check the similarity in your personal statement they automatically exclude anything that has been submitted previously under your details. However, I cannot find this information anymore.
Later edit: I'm probably not going down the road of copying anything, I'd rather not take that risk.