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

Yes

The word "céu" is identical in spelling, meaning, and grammatical function in both Brazilian and European Portuguese. The only difference lies in pronunciation. In Brazil, the "e" is typically pronounced with a more open sound, and the diphthong "eu" is very distinct. In Portugal, while the word is the same, the vowel sounds may be slightly more closed or subtle depending on the regional accent.

Brazilian Portuguese Examples

1. O céu está muito azul hoje. (The sky is very blue today.)
2. Olha para o céu, tem muitas estrelas. (Look at the sky, there are many stars.)
3. Sinto que estou no céu quando viajo. (I feel like I'm in heaven when I travel.)
4. O céu está ficando escuro, vai chover. (The sky is getting dark, it's going to rain.)
5. Que céu lindo nós temos aqui! (What a beautiful sky we have here!)

European Portuguese Examples

1. O céu está muito azul hoje. (The sky is very blue today.)
2. Olha para o céu, há muitas estrelas. (Look at the sky, there are many stars.)
3. Sinto que estou no céu quando viajo. (I feel like I'm in heaven when I travel.)
4. O céu está a ficar escuro, vai chover. (The sky is getting dark, it's going to rain.)
5. Que céu lindo temos aqui! (What a beautiful sky we have here!)