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

Yes.

The only difference between the word "flores" in Brazilian Portuguese and Continental Portuguese is pronunciation.

In Brazilian Portuguese, the unstressed "e" in "flores" is typically pronounced with a more audible, clearer vowel sound (often sounding like /is/ or /ɛs/ depending on the regional accent). In Continental Portuguese, unstressed vowels are heavily reduced; the "e" is often almost silent, and the "s" at the end of the word is frequently pronounced as a "sh" sound (/ʃ/). Consequently, a Portuguese person might pronounce the word so that it sounds closer to "flôrs" or "flôrsh."

Brazilian Portuguese Examples

1. Eu comprei flores para você. (I bought flowers for you.)
2. As flores são muito lindas. (The flowers are very beautiful.)
3. Ela adora flores do campo. (She loves wildflowers.)
4. Tem muitas flores no jardim. (There are many flowers in the garden.)
5. Eu vou te dar flores. (I am going to give you flowers.)

Continental Portuguese Examples

1. Eu comprei flores para ti. (I bought flowers for you.)
2. As flores são muito lindas. (The flowers are very beautiful.)
3. Ela adora flores do campo. (She loves wildflowers.)
4. Há muitas flores no jardim. (There are many flowers in the garden.)
5. Vou dar-te flores. (I am going to give you flowers.)