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

No

Differences in Usage, Pronunciation, and Grammar

• Pronunciation: In Brazilian Portuguese, the "l" at the end of the word is typically vocalized, sounding like a "u" ([kwau]). In Continental Portuguese, the "l" is a clear alveolar "l" ([kwal]).
• Interrogative Usage: In Brazil, "qual" is the standard way to ask "what" (e.g., "Qual é o seu nome?"), even when there is no explicit group of choices. In Portugal, "que" is much more common for "what" in an open-ended sense, while "qual" is strictly reserved for "which" (selecting from a specific group).
• Relative Pronoun Usage: In Brazil, the forms "o qual" and "a qual" are very rare in spoken language and are used almost exclusively in formal writing to avoid ambiguity. In Portugal, "o qual" and "a qual" are used more naturally in both speech and writing to clarify the antecedent.
• Grammatical Context: While the word itself remains the same, the surrounding grammar changes. A Brazilian would naturally use the pronoun "seu/sua," whereas a Portuguese person would naturally use "teu/tua" in the same context.

Brazilian Portuguese Examples

1. Qual é o seu nome? (What is your name?)
2. Qual é a sua cor favorita? (What is your favorite color?)
3. Qual destes você quer? (Which of these do you want?)
4. Qual é o seu endereço? (What is your address?)
5. Qual é o problema? (What is the problem?)

Continental Portuguese Examples

1. Que nome tens? (What name do you have?)
2. Que cor é que preferes? (What color do you prefer?)
3. Qual destes é que queres? (Which of these is it that you want?)
4. Qual é o teu endereço? (What is your address?)
5. Que problema é que há? (What problem is there?)