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

Yes

The spelling, meaning, and grammar of "histórias" are identical in both Brazilian and Continental Portuguese. The only difference is in pronunciation. In Brazilian Portuguese, the vowels are typically more open and clearly articulated. In Continental Portuguese, unstressed vowels are often more reduced or "swallowed," and the rhythm of speech is more stress-timed, which can make the word sound more closed or clipped compared to the Brazilian pronunciation.

Brazilian Portuguese usage:

1. Ele adora contar histórias para as crianças. (He loves telling stories to the children.)
2. Não venha com essas histórias para mim! (Don't come to me with those stories/excuses!)
3. Eu li várias histórias de terror ontem à noite. (I read several horror stories last night.)
4. As histórias do meu avô são fascinantes. (My grandfather's stories are fascinating.)
5. Ela escreveu um livro de histórias curtas. (She wrote a book of short stories.)

Continental Portuguese usage:

1. Ele gosta de contar histórias às crianças. (He likes telling stories to the children.)
2. Não me venhas com essas histórias! (Don't come to me with those stories!)
3. Li umas histórias de terror ontem à noite. (I read some horror stories last night.)
4. As histórias do meu avô são fantásticas. (My grandfather's stories are fantastic.)
5. Ela escreveu um livro de contos. (She wrote a book of short stories/tales.)