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

No

The difference between the two is primarily in spelling and pronunciation.

• Spelling: In Brazilian Portuguese, the word is spelled with a circumflex accent (metrô) to indicate that the final "o" is a closed vowel. In European Portuguese, the accent is not used, and it is written as metro.
• Pronunciation: In Brazil, the "ô" is pronounced as a closed vowel [o]. In Portugal, while the vowel is also closed, the rhythm and the way the "o" is articulated in unstressed positions or within the flow of a sentence can differ slightly, and the lack of the written accent in Portugal reflects a different orthographic standard.
• Meaning/Usage: The meaning remains identical (an underground railway system), though minor prepositional usage around the word (e.g., "de metrô" vs. "do metro") tends to vary.

Brazilian Portuguese Examples

1. Eu vou de metrô para o trabalho todos os dias. (I go to work by subway every day.)
2. O metrô está muito lotado hoje. (The subway is very crowded today.)
3. Onde fica a estação de metrô mais próxima? (Where is the nearest subway station?)
4. Eu perdi o metrô porque me atrasei. (I missed the subway because I was late.)
5. O bilhete do metrô aumentou de preço. (The subway ticket increased in price.)

European Portuguese Examples

1. Eu vou de metro para o trabalho todos os dias. (I go to work by metro every day.)
2. O metro está muito cheio hoje. (The metro is very full today.)
3. Onde fica a estação do metro mais próxima? (Where is the nearest metro station?)
4. Perdi o metro porque me atrasei. (I missed the metro because I was late.)
5. O bilhete do metro aumentou de preço. (The metro ticket increased in price.)