(Re)bonjour,
I assume that there is a word missing in the second sentence. You might be refering to the sentence "Je me suis fait bronzer."
"J'ai bronzé" (I tanned) has almost the same meaning as "Je me suis fait bronzer", but the latter adds the idea that it was voluntary (I sunbathed).
"Je me suis bronzé" isn't grammatically correct because "bronzer" isn't a pronominal verb.
Best regards,
Muriel