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

Yes

The word "moscas" is identical in meaning, spelling, and grammar in both Brazilian and Continental Portuguese. The only difference is in pronunciation. In Brazilian Portuguese, the "s" at the end of the word is typically pronounced as a voiceless alveolar sibilant [s], similar to the "s" in the English word "sun." In Continental Portuguese, the "s" is usually pronounced as a voiceless postalveolar sibilant [ʃ], similar to the "sh" in the English word "shoe."

Brazilian Portuguese Examples

1. Tem muitas moscas no lixo. (There are many flies in the trash.)
2. Essas moscas não me deixam dormir. (These flies won't let me sleep.)
3. Eu vi várias moscas voando na sala. (I saw several flies flying in the living room.)
4. As moscas estão no açúcar. (The flies are in the sugar.)
5. Cuidado com as moscas na fruta. (Watch out for the flies on the fruit.)

Continental Portuguese Examples

1. Há muitas moscas no lixo. (There are many flies in the trash.)
2. Estas moscas não me deixam dormir. (These flies won't let me sleep.)
3. Vi várias moscas a voar na sala. (I saw several flies flying in the living room.)
4. As moscas estão no açúcar. (The flies are in the sugar.)
5. Cuidado com as moscas na fruta. (Watch out for the flies on the fruit.)