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

Yes

The spelling, meaning, and grammatical function of "catedrais" (the plural of catedral) are identical in both Brazilian and Continental Portuguese. The only differences are in pronunciation:

• Brazilian Portuguese: The vowels are generally more open and clearly articulated. The rhythm is more "syllable-timed," meaning each syllable receives more distinct weight.
• Continental Portuguese: Vowels in unstressed syllables (such as the "e" in catedrais) are often "reduced" or nearly silent. The rhythm is more "stress-timed," which can make the word sound more clipped or condensed to a non-native ear.

Brazilian Portuguese Examples

1. As catedrais de Minas Gerais são incríveis. (The cathedrals of Minas Gerais are incredible.)
2. Eu amo visitar catedrais antigas. (I love visiting old cathedrals.)
3. Essas catedrais são muito famosas por aqui. (These cathedrals are very famous around here.)
4. A gente foi ver as catedrais da cidade no feriado. (We went to see the city's cathedrals during the holiday.)
5. Você já viu as catedrais de pedra da Europa? (Have you seen the stone cathedrals of Europe?)

Continental Portuguese Examples

1. As catedrais de Évora são lindíssimas. (The cathedrals of Évora are very beautiful.)
2. Gosto imenso de visitar catedrais históricas. (I like visiting historic cathedrals immensely.)
3. Estas catedrais têm muita história para contar. (These cathedrals have a lot of history to tell.)
4. Fomos visitar as catedrais de Coimbra com a família. (We went to visit the cathedrals of Coimbra with the family.)
5. As catedrais de Portugal são muito interessantes para o turismo. (The cathedrals of Portugal are very interesting for tourism.)