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

Yes

The word "arquitetas" is identical in meaning, spelling, and grammatical function in both Brazilian and European Portuguese. The only difference lies in pronunciation. In Brazilian Portuguese, vowels tend to be more open and clearly articulated. In Continental (European) Portuguese, unstressed vowels are often reduced or "swallowed," which can make the word sound more "clipped" or "closed" to a Brazilian ear.

Brazilian Portuguese Examples

1. As arquitetas estão fazendo o projeto. (The architects are making the project.)
2. Eu conheci duas arquitetas incríveis. (I met two incredible architects.)
3. As arquitetas estão trabalhando na reforma. (The architects are working on the renovation.)
4. As arquitetas estão chamando o cliente. (The architects are calling the client.)
5. As arquitetas estão preparando a planta. (The architects are preparing the floor plan.)

European Portuguese Examples

1. As arquitetas estão a fazer o projeto. (The architects are making the project.)
2. Eu conheci duas arquitetas incríveis. (I met two incredible architects.)
3. As arquitetas estão a trabalhar na reforma. (The architects are working on the renovation.)
4. As arquitetas estão a chamar o cliente. (The architects are calling the client.)
5. As arquitetas estão a preparar a planta. (The architects are preparing the floor plan.)