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

Yes.

The word piadas is identical in meaning, spelling, and grammatical function in both Brazilian and Continental Portuguese. The only difference lies in pronunciation:

• Brazilian Portuguese: In most regions of Brazil, the "d" is palatalized, meaning it sounds like a "dj" (e.g., pi-ah-dji). The vowels are also more open and resonant.
• Continental Portuguese: The "d" is a dental sound, pronounced with the tongue against the teeth, similar to the "d" in the English word "dog." Additionally, the unstressed vowels are more closed or reduced, making the word sound shorter and more clipped.

Brazilian Portuguese Examples

1. Eu adoro contar piadas para as crianças. (I love telling jokes to children.)
2. Aquela piada foi muito engraçada! (That joke was very funny!)
3. Ele vive fazendo piada de tudo o que acontece. (He is always making jokes about everything that happens.)
4. Você conhece alguma piada boa? (Do you know any good jokes?)
5. Essa piada é muito ruim, não tem graça nenhuma. (This joke is very bad; it's not funny at all.)

Continental Portuguese Examples

1. Eu adoro contar piadas às crianças. (I love telling jokes to the children.)
2. Aquela piada foi muito engraçada! (That joke was very funny!)
3. Ele vive a fazer piada de tudo o que acontece. (He is always making jokes about everything that happens.)
4. Conheces alguma piada boa? (Do you know any good jokes?)
5. Esta piada é muito má, não tem piada nenhuma. (This joke is very bad; it has no humor/fun in it at all.)