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

Yes.

The spelling, meaning, and grammatical function of the word "brasileiros" are identical in both Brazilian and Continental Portuguese. The only difference is pronunciation.

In Brazilian Portuguese, the vowels are generally more "open" and clearly articulated, even in unstressed syllables. In Continental Portuguese, there is a significant tendency toward vowel reduction; unstressed vowels (like the "e" in brasileiros) are often shortened, neutralized, or almost entirely swallowed, making the word sound more consonant-heavy.

Brazilian Portuguese Usage

1. Os brasileiros amam futebol. (Brazilians love soccer.)
2. Conheci muitos brasileiros na viagem. (I met many Brazilians on the trip.)
3. Os brasileiros são muito engraçados. (Brazilians are very funny.)
4. Tem muitos brasileiros morando aqui. (There are many Brazilians living here.)
5. Os brasileiros são muito legais. (Brazilians are very cool.)

Continental Portuguese Usage

1. Os brasileiros adoram futebol. (Brazilians adore soccer.)
2. Conheci muitos brasileiros na viagem. (I met many Brazilians on the trip.)
3. Os brasileiros são muito engraçados. (Brazilians are very funny.)
4. Há muitos brasileiros a viver aqui. (There are many Brazilians living here.)
5. Os brasileiros são muito porreiros. (Brazilians are very cool.)