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

No.

While the core meanings of "banca"—such as a market stall (banca de feira) or an examining committee (banca examinadora)—are shared, there are differences in typical usage and idiomatic expression. In Brazilian Portuguese, "banca" is used colloquially in expressions like "dar banca" (to act superior or show off) or "bancar" (to pretend to be something). In Portugal, these specific idiomatic uses are not standard; instead, a person would typically use "fazer-se" (to pretend) or "ser convencido" (to be conceited). Additionally, for kitchen counters or worktops, Brazilians may use "banca," whereas Portuguese speakers almost exclusively use "bancada."

Brazilian Portuguese

1. Eu compro revistas na banca de jornal. (I buy magazines at the newsstand.)
2. A banca da cozinha é de mármore. (The kitchen countertop is made of marble.)
3. Ele adora dar banca para impressionar os outros. (He loves to act superior to impress others.)
4. Ela sempre banca a difícil quando eu ligo. (She always pretends to be hard to get when I call.)
5. Vou passar na banca de frutas para comprar laranjas. (I'm going to stop by the fruit stall to buy oranges.)

European Portuguese

1. Eu compro revistas na banca de jornais. (I buy magazines at the newsstand.)
2. A bancada da cozinha é de mármore. (The kitchen countertop is made of marble.)
3. Ele é muito convencido para impressionar os outros. (He is very conceited to impress others.)
4. Ela faz-se de difícil quando eu ligo. (She pretends to be hard to get when I call.)
5. Vou passar na banca de frutas para comprar laranjas. (I'm going to stop by the fruit stall to buy oranges.)