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

Yes

The word "borrachas" is identical in meaning, spelling, and grammar in both Brazilian and Continental Portuguese. The only difference is pronunciation. In Brazilian Portuguese, the unstressed vowels (such as the final "a") are typically more open and clearly articulated. In Continental Portuguese, these same vowels are often more closed, reduced, or almost entirely swallowed, creating a more "clipped" phonetic rhythm.

Brazilian Portuguese Examples

1. Eu perdi minhas borrachas na escola. (I lost my erasers at school.)
2. Essas borrachas são muito macias. (These erasers are very soft.)
3. Preciso comprar borrachas novas para o desenho. (I need to buy new erasers for the drawing.)
4. As borrachas de apagar lápis são pequenas. (The pencil erasers are small.)
5. Guarde as borrachas na mochila. (Put the erasers in the backpack.)

Continental Portuguese Examples

1. Perdi as minhas borrachas na escola. (I lost my erasers at school.)
2. Estas borrachas são bastante macias. (These erasers are quite soft.)
3. É preciso comprar borrachas novas para o desenho. (It is necessary to buy new erasers for the drawing.)
4. As borrachas de apagar o lápis são pequenas. (The erasers for erasing the pencil are small.)
5. Guarda as borrachas no saco. (Put the erasers in the bag.)