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

Yes

The word "importante" is identical in spelling, meaning, and grammar in both Brazilian and Continental Portuguese. The only difference lies in the pronunciation of the final vowel. In Brazilian Portuguese, the final "e" is typically pronounced clearly, sounding like a light "ee" (/i/). In Continental Portuguese, the final "e" is heavily reduced, sounding like a neutral "schwa" or becoming almost silent, which can make the word sound more like "importânt."

Brazilian Portuguese Examples

1. "É muito importante chegar no horário." (It is very important to arrive on time.)
2. "Eu tenho um aviso importante para você." (I have an important announcement for you.)
3. "Não ache que isso não é importante." (Don't think that this isn't important.)
4. "O trabalho é a parte mais importante do dia." (Work is the most important part of the day.)
5. "Você é uma pessoa muito importante para a nossa equipe." (You are a very important person to our team.)

Continental Portuguese Examples

1. "É muito importante que tu chegues a horas." (It is very important that you arrive on time.)
2. "Tenho um aviso importante para te dar." (I have an important announcement to give you.)
3. "Não aches que isto não é importante." (Don't think that this isn't important.)
4. "O trabalho é a parte mais importante do dia." (Work is the most important part of the day.)
5. "Tu és uma pessoa muito importante para a nossa equipa." (You are a very important person to our team.)