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

No.

While the word "banheiros" is grammatically identical and carries the same basic meaning in both dialects, there is a significant difference in typical usage. In Brazil, "banheiro" is the standard, everyday word used to refer to a restroom, toilet, or bathroom. In Portugal, while "banheiro" is understood, it is much more common and natural to use the term "casa de banho."

Brazilian Portuguese (Typical Usage)

1. Onde fica o banheiro? (Where is the bathroom?)
2. Os banheiros deste restaurante são muito limpos. (The bathrooms in this restaurant are very clean.)
3. Eu preciso comprar novos tapetes para os banheiros. (I need to buy new rugs for the bathrooms.)
4. Os banheiros estão fechados para manutenção. (The bathrooms are closed for maintenance.)
5. A casa tem dois banheiros. (The house has two bathrooms.)

Continental Portuguese (Typical Usage)

1. Onde fica a casa de banho? (Where is the bathroom?)
2. As casas de banho deste restaurante são muito limpas. (The bathrooms in this restaurant are very clean.)
3. Eu preciso de comprar novos tapetes para as casas de banho. (I need to buy new rugs for the bathrooms.)
4. As casas de banho estão fechadas para manutenção. (The bathrooms are closed for maintenance.)
5. A casa tem duas casas de banho. (The house has two bathrooms.)