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

Yes

The word "músculo" is identical in spelling, meaning, and grammatical category in both Brazilian and Continental Portuguese. The only difference lies in pronunciation:

• Brazilian Portuguese: The vowels are generally more "open" and clearly articulated. The unstressed final "o" is pronounced as a clear [u] sound, and the rhythm of the word is more syllable-timed, making each vowel relatively distinct.
• Continental Portuguese: The vowels are more "reduced" or "closed." Unstressed vowels are often swallowed or shortened significantly. The rhythm is more stress-timed, meaning the "u" and "o" might sound much more subtle or nearly silent to a non-native ear compared to the Brazilian pronunciation.

Brazilian Portuguese Examples

1. Eu estou sentindo uma dor no músculo da perna. (I am feeling a pain in my leg muscle.)
2. Ele tem os músculos muito fortes por causa da academia. (He has very strong muscles because of the gym.)
3. Eu tive uma lesão no músculo do braço. (I had a muscle injury in my arm.)
4. Você precisa treinar cada músculo do seu corpo. (You need to train every muscle in your body.)
5. O músculo abdominal dele está bem definido. (His abdominal muscle is very well-defined.)

Continental Portuguese Examples

1. Estou a sentir uma dor no músculo da perna. (I am feeling a pain in my leg muscle.)
2. Ele tem os músculos bastante fortes devido ao ginásio. (He has quite strong muscles due to the gym.)
3. Sofri uma lesão no músculo do braço. (I suffered a muscle injury in my arm.)
4. É preciso treinar cada músculo do corpo. (It is necessary to train every muscle in the body.)
5. O músculo abdominal está bem definido. (The abdominal muscle is well-defined.)