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

Yes

The word "precisei" is identical in meaning, spelling, and grammatical conjugation in both Brazilian and Continental Portuguese. It is the first-person singular of the pretérito perfeito (past tense) of the verb precisar (to need). The only difference is in pronunciation. In Brazil, the unstressed vowel "e" is typically more open, and the diphthong "ei" is pronounced with a more distinct, melodic cadence. In Portugal, the unstressed "e" is often reduced to a nearly silent, closed sound (schwa-like), making the word sound more clipped.

Brazilian Portuguese Examples

1. Precisei de ajuda para terminar o trabalho. (I needed help to finish the work.)
2. Precisei comprar um celular novo. (I needed to buy a new cell phone.)
3. Precisei de um tempo para pensar sozinho. (I needed some time to think alone.)
4. Precisei pedir desculpas a ela pelo erro. (I needed to apologize to her for the mistake.)
5. Precisei de dinheiro para o conserto do carro. (I needed money for the car repair.)

Continental Portuguese Examples

1. Precisei de ajuda para terminar o trabalho. (I needed help to finish the work.)
2. Precisei comprar um telemóvel novo. (I needed to buy a new mobile phone.)
3. Precisei de algum tempo para pensar sozinho. (I needed some time to think alone.)
4. Precisei pedir desculpa a ela pelo erro. (I needed to apologize to her for the mistake.)
5. Precisei de dinheiro para o arranjo do carro. (I needed money for the car repair.)