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

Yes

The spelling, meaning, and grammar of "fortes" are identical in both Brazilian and Continental Portuguese. The only difference is in pronunciation. In Brazilian Portuguese, the unstressed final "e" is typically reduced to an [i] sound (making the word sound similar to "fortis"). In Continental Portuguese, the final "e" is reduced to a much more closed, neutral, and near-unrounded vowel [ɨ], which is a characteristic feature of the European Portuguese phonetic system.

Brazilian Portuguese Examples:

1. Eles são muito fortes. (They are very strong.)
2. Os ventos estavam muito fortes ontem. (The winds were very strong yesterday.)
3. Essas cores são muito fortes. (Those colors are very strong/vibrant.)
4. Eles têm opiniões muito fortes. (They have very strong opinions.)
5. Esses cheiros são fortes demais. (Those smells are too strong.)

Continental Portuguese Examples:

1. Eles são bastante fortes. (They are quite strong.)
2. Os ventos estavam muito fortes ontem. (The winds were very strong yesterday.)
3. Estas cores são muito fortes. (These colors are very strong/vibrant.)
4. Eles têm opiniões muito fortes. (They have very strong opinions.)
5. Estes cheiros são demasiado fortes. (These smells are too strong.)