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

Yes

The only difference is in the pronunciation. In Brazilian Portuguese, the "te" is palatalized, meaning the "t" takes on a "ch" sound, making the word sound like seh-chee ([ˈsetʃi]). In Continental Portuguese, the "t" is a dental sound (tongue against the teeth) and the final "e" is a reduced, nearly silent vowel, making the word sound more like set ([ˈsetɨ]).

Brazilian Portuguese examples:

1. Eu tenho sete irmãos. (I have seven siblings.)
2. São sete horas da manhã. (It is seven in the morning.)
3. Comprei sete laranjas na feira. (I bought seven oranges at the market.)
4. O ônibus passa às sete. (The bus passes at seven.)
5. Eu ganhei sete reais. (I won seven reais.)

Portuguese examples:

1. Tenho sete irmãos. (I have seven siblings.)
2. São sete horas da manhã. (It is seven in the morning.)
3. Comprei sete laranjas na feira. (I bought seven oranges at the market.)
4. O autocarro passa às sete. (The bus passes at seven.)
5. Ganhei sete euros. (I won seven euros.)