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

Yes

The word "cinco" is identical in spelling, meaning, and grammatical function in both Brazilian and European Portuguese. The only difference is in pronunciation. In Brazilian Portuguese, the vowels are typically more open and the rhythm is "syllable-timed," making the word sound more melodic. In European Portuguese, unstressed vowels are often more heavily reduced or "closed," which gives the word a more clipped, "stress-timed" sound.

Brazilian Portuguese Examples

1. Eu tenho cinco reais. (I have five reais.)
2. Você tem cinco minutos? (Do you have five minutes?)
3. Eu vi cinco cachorros na rua. (I saw five dogs on the street.)
4. Ela comeu cinco brigadeiros. (She ate five brigadeiros.)
5. São cinco horas da tarde. (It is five o'clock in the afternoon.)

European Portuguese Examples

1. Eu tenho cinco euros. (I have five euros.)
2. Tens cinco minutos? (Do you have five minutes?)
3. Vi cinco cães na rua. (I saw five dogs on the street.)
4. Ela comeu cinco doces. (She ate five sweets.)
5. São cinco horas da tarde. (It is five o'clock in the afternoon.)