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

Yes.

The only difference between the use of "noventa" in Brazilian Portuguese and Continental Portuguese is pronunciation. In Brazilian Portuguese, the "e" is generally pronounced as a clear, audible vowel (though it may be slightly reduced to an "i" sound in certain regional dialects). In Continental Portuguese, the "e" is often heavily reduced or almost silent (a schwa), which makes the transition between the "n" and the "t" much more abrupt and compressed.

Brazilian Portuguese examples:

1. Ele já está com noventa anos. (He is already ninety years old.)
2. A velocidade máxima é de noventa quilômetros por hora. (The maximum speed is ninety kilometers per hour.)
3. Ele ganhou noventa reais no sorteio. (He won ninety reais in the draw.)
4. A prova tem noventa questões. (The exam has ninety questions.)
5. O preço subiu de noventa para cem reais. (The price went up from ninety to one hundred reais.)

Continental Portuguese examples:

1. Ele já está com noventa anos. (He is already ninety years old.)
2. A velocidade máxima é de noventa quilómetros por hora. (The maximum speed is ninety kilometers per hour.)
3. Ele ganhou noventa euros no sorteio. (He won ninety euros in the draw.)
4. O exame tem noventa questões. (The exam has ninety questions.)
5. O preço subiu de noventa para cem euros. (The price went up from ninety to one hundred euros.)