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

No

The word séries is not identical in usage between Brazilian and Continental Portuguese. While both dialects use the word to refer to television programs or a sequence of events, there is a significant difference in how school grades are described. In Brazil, "série" is the standard term for a school grade (e.g., "5ª série"), whereas in Portugal, this is expressed using the word ano (e.g., "5º ano"). Additionally, while the spelling and core meaning are the same, the grammatical structures surrounding the word often differ, such as the use of the gerund in Brazil versus the infinitive in Portugal.

Brazilian Portuguese

1. Eu adoro assistir a novas séries. (I love watching new series.)
2. Ele enfrentou várias séries de desafios. (He faced several series of challenges.)
3. As séries do ensino fundamental são muito importantes. (The elementary school grades are very important.)
4. Ele coleciona várias séries de selos. (He collects several series of stamps.)
5. Quais são as suas séries favoritas? (What are your favorite series?)

Continental Portuguese

1. Eu adoro ver novas séries. (I love watching new series.)
2. Ele enfrentou várias sequências de desafios. (He faced several sequences of challenges.)
3. Os anos do ensino básico são muito importantes. (The primary school years are very important.)
4. Ele coleciona várias coleções de selos. (He collects several collections of stamps.)
5. Quais são as tuas séries preferidas? (What are your favorite series?)