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

Yes

The spelling, meaning, and grammar of "decoração" are identical in both Brazilian and European Portuguese. The primary difference is pronunciation. In Brazilian Portuguese, the vowels are generally more open and clearly articulated. In European Portuguese, unstressed vowels (such as the initial "e") are often reduced, shortened, or nearly silent, making the word sound more "compressed." Additionally, while both use the word for the act of decorating and the objects used, a Brazilian might more frequently use "decoração" as a shorthand for the decorative objects themselves (e.g., "comprar decoração"), whereas a Portuguese person is slightly more likely to refer to them as "artigos" or "objetos de decoração."

Brazilian Portuguese Examples

1. A decoração da festa de aniversário ficou maravilhosa. (The birthday party decoration turned out wonderful.)
2. Eu adoro essa decoração minimalista na sua sala. (I love that minimalist decoration in your living room.)
3. Precisamos comprar alguns itens de decoração para o quarto. (We need to buy some decor items for the bedroom.)
4. A decoração de Natal deste ano está bem colorida. (This year's Christmas decoration is very colorful.)
5. Ela trabalha com decoração de interiores há dez anos. (She has worked with interior design for ten years.)

European Portuguese Examples

1. A decoração da festa está a ficar fantástica. (The party decoration is becoming fantastic.)
2. Gosto imenso desta decoração mais sóbria. (I like this more sober/restrained decoration very much.)
3. Comprámos novos artigos de decoração para o escritório. (We bought new decor items for the office.)
4. A decoração do restaurante é muito acolhedora. (The decoration of the restaurant is very cozy.)
5. Esta decoração de Natal é bastante tradicional. (This Christmas decoration is quite traditional.)