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

Yes

The word "bananas" is identical in both Brazilian and Continental Portuguese regarding its meaning, spelling, and grammar. The only difference is in pronunciation:

• Brazilian Portuguese: The vowels are generally more open, and the final "s" is pronounced as a sibilant /s/ (similar to the "s" in "sun").
• Continental Portuguese: The vowels are more closed or "reduced," and the final "s" is pronounced as a postalveolar fricative /ʃ/ (similar to the "sh" in "shoe").

Brazilian Portuguese Examples

1. Eu comprei um cacho de bananas hoje. (I bought a bunch of bananas today.)
2. Essas bananas estão bem docinhas. (These bananas are very sweet.)
3. Você gosta de comer bananas com aveia? (Do you like to eat bananas with oats?)
4. As bananas de prata são as minhas favoritas. (The prata bananas are my favorites.)
5. Tem muitas bananas na fruteira. (There are many bananas in the fruit bowl.)

Continental Portuguese Examples

1. Eu comprei um cacho de bananas hoje. (I bought a bunch of bananas today.)
2. Estas bananas estão muito doces. (These bananas are very sweet.)
3. Gosta de comer bananas com aveia? (Do you like to eat bananas with oats?)
4. As bananas pratas são as minhas favoritas. (The prata bananas are my favorites.)
5. Há muitas bananas na fruteira. (There are many bananas in the fruit bowl.)