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

Yes

The spelling, meaning, and grammatical function of "aceitei" are identical in both Brazilian and Continental Portuguese. The only difference is in pronunciation. In Brazilian Portuguese, vowels tend to be more "open" and clearly articulated. In Continental Portuguese, unstressed vowels (such as the "e" in the first syllable) are often reduced or "swallowed," making the word sound more clipped and staccato.

Brazilian Portuguese Examples

1. Eu aceitei o convite para o churrasco. (I accepted the invitation to the barbecue.)
2. Eu aceitei o emprego na nova empresa. (I accepted the job at the new company.)
3. Eu aceitei a proposta de casamento. (I accepted the marriage proposal.)
4. Eu aceitei as desculpas dele. (I accepted his apologies.)
5. Eu aceitei o desafio de aprender piano. (I accepted the challenge of learning piano.)

Portuguese Examples

1. Aceitei o convite para o jantar. (I accepted the invitation to dinner.)
2. Aceitei o emprego que me ofereceram. (I accepted the job they offered me.)
3. Aceitei a proposta que recebi. (I accepted the proposal I received.)
4. Aceitei as desculpas da minha irmã. (I accepted my sister's apologies.)
5. Aceitei o desafio proposto. (I accepted the proposed challenge.)