They have the same function because both sentences are related about a third person. The difference is in the first sentence you write lleváselas (it’s talking about something, you add a syllable (la, lo, las, los) depending of the case) and the second sentence levantarse (it’s talking about somebody), in this case you don’t put a syllable in the end. You use the following pronouns depending of the person. I = Me : llévamelo(la), levantarme You = Te : llévatelo(la), levántate He, She = Se : llévaselo(la), levántalo(la) We = Nos : llevémonoslo(la), levantémonos They = las, los : llévaselas(los)

Sé, formas conjugadas de los verbo saber y ser. I advice you check this page: http://es.wikipedia.org/wiki/Se