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

No

While the spelling and core meaning are identical, the typical usage differs regarding number. In Brazilian Portuguese, "pipoca" is commonly used as a mass noun in the singular to refer to the snack. In Continental Portuguese, the plural "pipocas" is the standard way to refer to the snack. Additionally, there is a phonetic difference: Brazilian Portuguese features more open, clearly articulated vowels, whereas Continental Portuguese involves significant reduction or "closing" of unstressed vowels.

Brazilian Portuguese examples:

1. Eu adoro comer pipoca vendo filme. (I love eating popcorn while watching a movie.)
2. A pipoca está muito salgada. (The popcorn is very salty.)
3. Vou fazer pipoca para o pessoal. (I am going to make popcorn for everyone.)
4. Sobrou um pouco de pipoca na panela. (A little bit of popcorn is left in the pan.)
5. Pipoca com manteiga é a minha favorita. (Popcorn with butter is my favorite.)

European Portuguese examples:

1. Eu adoro comer pipocas enquanto vejo um filme. (I love eating popcorn while watching a movie.)
2. As pipocas estão muito salgadas. (The popcorn is very salty.)
3. Vamos fazer pipocas para a malta? (Shall we make some popcorn for the group?)
4. Sobraram pipocas na panela. (There was some popcorn left in the pan.)
5. Pipocas com manteiga são as minhas favoritas. (Popcorn with butter is my favorite.)