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

Yes

The word "frio" is identical in both Brazilian and European Portuguese in terms of meaning, spelling, and grammar. The difference lies solely in pronunciation and the rhythmic patterns of speech. In Brazilian Portuguese, the vowels are generally more open and the intonation is more melodic. In European Portuguese, the pronunciation is much more "closed," characterized by significant vowel reduction (where unstressed vowels are shortened or nearly eliminated), which can make the word sound more clipped or compressed to a listener.

Brazilian Portuguese Examples:

1. Está um frio de rachar hoje! (It's freezing today!)
2. Eu não gosto de tempo frio. (I don't like cold weather.)
3. A água da piscina está muito fria. (The pool water is very cold.)
4. Ele é um cara muito frio e sem emoção. (He is a very cold and emotionless guy.)
5. Tá muito frio, melhor pegar um casaco. (It's very cold, better grab a coat.)

European Portuguese Examples:

1. Está um frio terrível aqui fora. (It is a terrible cold out here.)
2. Não suporto este frio constante. (I can't stand this constant cold.)
3. A sopa está fria, pode aquecer? (The soup is cold, can you heat it up?)
4. Está um frio de morrer! (It's deathly cold!)
5. O vento está muito frio esta manhã. (The wind is very cold this morning.)