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

Yes

The word "alunos" is identical in meaning, spelling, and grammar in both Brazilian and Continental Portuguese. The only difference lies in pronunciation. In Brazilian Portuguese, the vowels are generally more open and clearly articulated, and the rhythm is more melodic. In Continental Portuguese, unstressed vowels undergo significant reduction; the "o" in "alunos" often becomes a very short, closed sound (almost like a schwa), and the overall cadence is more "staccato" or consonant-heavy.

Brazilian Portuguese Examples

1. Os alunos estão estudando para a prova. (The students are studying for the exam.)
2. A professora gosta muito dos seus alunos. (The teacher likes her students very much.)
3. Tem muitos alunos na sala de aula. (There are many students in the classroom.)
4. Os alunos fizeram um trabalho incrível. (The students did an incredible job.)
5. Os alunos novos chegaram agora. (The new students arrived now.)

Continental Portuguese Examples

1. Os alunos estão a estudar para o exame. (The students are studying for the exam.)
2. A professora gosta muito dos seus alunos. (The teacher likes her students very much.)
3. Há muitos alunos na sala de aula. (There are many students in the classroom.)
4. Os estudantes fizeram um trabalho incrível. (The students did an incredible job.)
5. Os novos alunos chegaram agora. (The new students arrived now.)