Is the word ator the same in Brazilian and European Portuguese?

Yes

The word "ator" is spelled identically and carries the same meaning in both Brazilian and Continental Portuguese. The only difference lies in pronunciation. In Brazil, the pronunciation of the final "r" varies significantly depending on the region (it may be retroflex, tapped, or even aspirated/silent in certain dialects), and the vowels are generally more open. In Portugal, the "r" is typically more clearly tapped or trilled, and the vowels are more closed and reduced.

Brazilian Portuguese Examples

1. Ele é um ator muito famoso no Brasil. (He is a very famous actor in Brazil.)
2. Aquele ator interpreta muito bem o vilão. (That actor plays the villain very well.)
3. Eu quero ser ator quando crescer. (I want to be an actor when I grow up.)
4. O ator ganhou um prêmio importante ontem. (The actor won an important award yesterday.)
5. Aquele ator de novela é muito bonito. (That soap opera actor is very handsome.)

Continental Portuguese Examples

1. Ele é um ator muito conhecido em Portugal. (He is a very well-known actor in Portugal.)
2. Aquele ator interpreta muito bem o vilão. (That actor plays the villain very well.)
3. Eu quero ser ator quando for grande. (I want to be an actor when I am grown up.)
4. O ator recebeu um prémio importante ontem. (The actor received an important award yesterday.)
5. Aquele ator de cinema é muito bonito. (That film actor is very handsome.)