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

Yes.

The word "sal" is identical in meaning, spelling, and grammar in both Brazilian and Continental Portuguese. The only difference lies in pronunciation. In much of Brazil, the "l" at the end of a word or syllable is often vocalized, making it sound similar to a "u" (sounding like sau). In Portugal, the "l" is typically pronounced as a clear lateral consonant, and the vowels tend to be more closed and less nasalized than in many Brazilian dialects.

Brazilian Portuguese Examples

1. Você pode me passar o sal? (Can you pass me the salt?)
2. Essa carne está sem sal nenhum. (This meat is completely tasteless.)
3. Eu gosto de colocar sal na pipoca. (I like to put salt on popcorn.)
4. Preciso comprar um pacote de sal. (I need to buy a packet of salt.)
5. Não exagera no sal, por favor. (Don't overdo the salt, please.)

Continental Portuguese Examples

1. Podes passar-me o sal? (Can you pass me the salt?)
2. Esta carne está sem sal nenhum. (This meat is completely tasteless.)
3. Eu gosto de pôr sal nas pipocas. (I like to put salt on the popcorn.)
4. Preciso de comprar um pacote de sal. (I need to buy a packet of salt.)
5. Não abuses do sal, por favor. (Don't overdo the salt, please.)