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

Yes.

The word "chilenos" is identical in meaning, spelling, and grammatical function in both Brazilian and Continental Portuguese. The only difference is pronunciation. In Brazilian Portuguese, the final "s" is typically pronounced as a sibilant [s] (though it sounds like "sh" in Rio de Janeiro), and the vowels are generally more open. In Continental Portuguese, the final "s" is almost always pronounced as a postalveolar fricative [ʃ] (sounding like "sh"), and the vowels tend to be more closed or reduced.

Brazilian Portuguese examples:

1. Os chilenos são muito gente boa. (Chileans are very nice/great people.)
2. Eu vi uns chilenos no aeroporto. (I saw some Chileans at the airport.)
3. Os chilenos gostam de viajar pelo Brasil. (Chileans like traveling through Brazil.)
4. Tem muitos chilenos estudando aqui. (There are many Chileans studying here.)
5. Os chilenos são muito receptivos. (Chileans are very welcoming.)

Portuguese (Portugal) examples:

1. Os chilenos são muito simpáticos. (Chileans are very friendly.)
2. Avistei alguns chilenos no aeroporto. (I spotted some Chileans at the airport.)
3. Os chilenos apreciam viajar pelo Brasil. (Chileans enjoy traveling through Brazil.)
4. Existem muitos chilenos a estudar aqui. (There are many Chileans studying here.)
5. Os chilenos são muito acolhedores. (Chileans are very welcoming.)