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

Yes

The differences between the use of "preferido" in Brazilian Portuguese and Continental Portuguese are strictly related to pronunciation. There are no differences in spelling, grammar, or the fundamental meaning of the word.

In Brazilian Portuguese, the pronunciation is more "open" and melodic. The vowels are clearly articulated, and the rhythm is syllable-timed, meaning each syllable receives a relatively similar amount of time.

In Continental Portuguese, the pronunciation is more "closed" and rhythmic. It is a stress-timed language, meaning unstressed vowels (like the "e" in pre- or -fe-) are often reduced, swallowed, or rendered almost silent. To an untrained ear, the word might sound shorter or more consonant-heavy in Portugal.

Brazilian Portuguese Examples

1. O meu filme preferido é o Batman. (My favorite movie is Batman.)
2. Qual é a sua comida preferida? (What is your favorite food?)
3. Esse é o meu lugar preferido no Brasil. (That is my favorite place in Brazil.)
4. O cachorro é o meu animal preferido. (The dog is my favorite animal.)
5. Eu escolhi o modelo preferido de celular. (I chose my favorite cell phone model.)

Continental Portuguese Examples

1. O meu filme preferido é o Batman. (My favorite movie is Batman.)
2. Qual é a tua comida preferida? (What is your favorite food?)
3. Este é o meu sítio preferido na zona. (This is my favorite place in the area.)
4. O cão é o meu animal preferido. (The dog is my favorite animal.)
5. Este é o meu telemóvel preferido. (This is my favorite mobile phone.)