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

Yes.

The only difference is in pronunciation. In most Brazilian dialects, the "s" in "das" is pronounced as a sibilant /s/ (similar to the "s" in "sun"). In Continental Portuguese, the "s" at the end of a syllable is typically palatalized, sounding like /ʃ/ (similar to the "sh" in "shoe"). There are no differences in meaning, grammar, or spelling.

Brazilian Portuguese

1. As cores das flores são muito legais. (The colors of the flowers are very cool.)
2. As chaves das casas sumiram. (The keys of the houses disappeared.)
3. As fotos das férias ficaram ótimas. (The photos of the vacation turned out great.)
4. As dicas das professoras foram úteis. (The tips from the teachers were useful.)
5. As balas das crianças são doces. (The candies of the children are sweet.)

European Portuguese

1. As cores das flores são lindíssimas. (The colors of the flowers are very beautiful.)
2. As chaves das casas perderam-se. (The keys of the houses were lost.)
3. As fotografias das férias ficaram excelentes. (The photographs of the vacation turned out excellent.)
4. As sugestões das professoras foram úteis. (The suggestions of the teachers were useful.)
5. Os rebuçados das crianças são doces. (The sweets of the children are sweet.)