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

No

While the spelling, grammar, and core meaning of "chamou" are identical in both dialects, there are differences in typical usage and pronunciation:

• Usage: In Brazil, "chamar" is frequently used to request services (e.g., "chamar um Uber" or "chamar um táxi"), whereas in Portugal, the verb "pedir" (to order/request) is much more natural. Additionally, Brazilians often use "chamar" to mean "to invite" (e.g., "ele me chamou para sair"), while a Portuguese person would typically use "convidar."
• Pronunciation: The vowel "a" is pronounced with a more open sound in Brazilian Portuguese and a more closed sound in Continental Portuguese.

Brazilian Portuguese usage:

1. Ele chamou o amigo. (He called the friend.)
2. Ela chamou um Uber. (She called an Uber.)
3. Ele chamou o cachorro. (He called the dog.)
4. O médico chamou o paciente. (The doctor called the patient.)
5. Ele me chamou para a festa. (He invited me to the party.)

Continental Portuguese usage:

1. Ele chamou o amigo. (He called the friend.)
2. Ela pediu um Uber. (She ordered an Uber.)
3. Ele chamou o cão. (He called the dog.)
4. O médico chamou o paciente. (The doctor called the patient.)
5. Ele convidou-me para a festa. (He invited me to the party.)