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

Yes

The word "preferidas" is identical in meaning, spelling, and grammar in both Brazilian and Continental Portuguese. The only difference is pronunciation.

In Brazilian Portuguese, the vowels are generally more open and clearly articulated. The unstressed vowels are pronounced more distinctly, making the word sound melodic and rhythmic.

In Continental Portuguese, the pronunciation is more "closed" due to a linguistic phenomenon called vowel reduction. Unstressed vowels are often shortened or almost swallowed, which can make the word sound more clipped, rapid, or "muffled" to a Brazilian ear.

Brazilian Portuguese Examples

1. Estas são as minhas músicas preferidas. (These are my favorite songs.)
2. Quais são as suas comidas preferidas? (What are your favorite foods?)
3. As cores preferidas dela são azul e verde. (Her favorite colors are blue and green.)
4. Eu gosto muito das minhas séries preferidas. (I like my favorite series very much.)
5. Estas são as fotos preferidas da viagem. (These are the favorite photos from the trip.)

Continental Portuguese Examples

1. Estas são as minhas músicas preferidas. (These are my favorite songs.)
2. Quais são as tuas comidas preferidas? (What are your favorite foods?)
3. As cores preferidas dela são o azul e o verde. (Her favorite colors are blue and green.)
4. Eu costumo ver as minhas séries preferidas. (I usually watch my favorite series.)
5. Estas são as fotografias preferidas da viagem. (These are the favorite photographs from the trip.)