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

Yes

The word tintas is identical in both Brazilian and Continental Portuguese in terms of meaning, spelling, and grammar. In both varieties, it refers to both ink (for writing or printing) and paint (for surfaces or art). The only difference is pronunciation: in Continental Portuguese, the vowels are more reduced (the final "a" in "tintas" is often pronounced as a very short, muffled "uh"), whereas in Brazilian Portuguese, the vowels are typically more open and clearly articulated.

Brazilian Portuguese Examples

1. As tintas da impressora acabaram. (The printer inks have run out.)
2. Eu adoro usar tintas coloridas no meu quadro. (I love using colorful paints on my painting.)
3. As tintas de canetinha são ótimas para as crianças. (The felt-tip pen inks are great for children.)
4. Você viu as tintas novas que eu comprei? (Did you see the new paints I bought?)
5. As tintas de parede secaram muito rápido. (The wall paints dried very quickly.)

Continental Portuguese Examples

1. As tintas da impressora esgotaram-se. (The printer inks have run out.)
2. Eu adoro usar tintas coloridas na minha tela. (I love using colorful paints on my canvas.)
3. As tintas de marcador são ótimas para as crianças. (The marker inks are great for children.)
4. Viste as tintas novas que eu comprei? (Did you see the new paints I bought?)
5. As tintas de parede secaram muito depressa. (The wall paints dried very quickly.)