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

Yes

The only differences between the use of "exposições" in Brazilian Portuguese and Continental Portuguese are in pronunciation. The spelling, grammar, meaning, and general usage of the word are identical in both varieties.

In terms of pronunciation:

• Brazilian Portuguese: The "s" sounds vary by region. In much of Brazil (like São Paulo), the "s" is pronounced as a soft "s" [s], whereas in Rio de Janeiro, it is pronounced as a "sh" [ʃ]. The vowels are generally more "open" and the rhythm is more melodic.
• Continental Portuguese: The "s" sounds are consistently pronounced as "sh" [ʃ] (a phenomenon called chiado). The vowels are generally "closed," and the rhythm of the word is more clipped and stress-timed.

Brazilian Portuguese examples:

1. As exposições de arte no centro são muito boas. (The art exhibitions downtown are very good.)
2. Ele gosta de visitar exposições de fotografia nos fins de semana. (He likes to visit photography exhibitions on the weekends.)
3. As exposições de eletrônicos na feira atraíram muita gente. (The electronics exhibitions at the fair attracted a lot of people.)
4. As exposições de livros da biblioteca foram canceladas. (The library's book exhibitions were cancelled.)
5. Gostamos muito das exposições de pintura da galeria. (We really liked the gallery's painting exhibitions.)

Portuguese (Portugal) examples:

1. As exposições de arte no museu são fantásticas. (The art exhibitions at the museum are fantastic.)
2. Fui a várias exposições de fotografia este ano. (I went to several photography exhibitions this year.)
3. As exposições de antiguidades são muito interessantes. (The antique exhibitions are very interesting.)
4. Ele estuda as exposições de design gráfico. (He studies the graphic design exhibitions.)
5. As exposições de escultura localizam-se na ala norte. (The sculpture exhibitions are located in the north wing.)