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

No.

While the meaning and spelling of "aceito" are the same in both varieties, there is a difference in typical usage and grammar regarding its use as a past participle.

In Brazilian Portuguese, "aceito" is the standard form for the past participle (e.g., "the offer was accepted"). In Continental Portuguese, the form "aceite" is the standard for the past participle. Therefore, while a Portuguese person would use "aceito" to say "I accept" (first person singular), they would almost always switch to "aceite" when expressing that something "was accepted" (passive voice). Additionally, there are differences in pronunciation, as Brazilian Portuguese tends to have more open vowels, while Continental Portuguese often reduces or de-emphasizes unstressed vowels.

Brazilian Portuguese Examples:

1. Eu aceito o seu convite. (I accept your invitation.)
2. O pagamento foi aceito pelo sistema. (The payment was accepted by the system.)
3. Eu aceito o desafio. (I accept the challenge.)
4. O seu cartão foi aceito aqui. (Your card was accepted here.)
5. O termo foi aceito por todos os sócios. (The term was accepted by all partners.)

Continental Portuguese Examples:

1. Eu aceito o teu convite. (I accept your invitation.)
2. O pagamento foi aceite pelo sistema. (The payment was accepted by the system.)
3. Eu aceito o desafio. (I accept the challenge.)
4. O teu cartão foi aceite aqui. (Your card was accepted here.)
5. O termo foi aceite por todos os sócios. (The term was accepted by all partners.)