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

Yes

The word "iniciante" is identical in spelling, meaning, and grammatical function in both Brazilian and Continental Portuguese. The only difference lies in pronunciation. In Brazilian Portuguese, the unstressed final "e" is pronounced as a clear, bright /i/ (similar to the "ee" in "see"), and the vowels are generally more open. In Continental Portuguese, the final "e" is highly reduced, often sounding like a very short, muffled /ɨ/ or even becoming nearly silent, and the vowels are more closed and "clipped."

Brazilian Portuguese Examples

1. Eu sou iniciante no violão. (I am a beginner at the acoustic guitar.)
2. Este curso é voltado para iniciantes. (This course is aimed at beginners.)
3. Ele é um iniciante na musculação. (He is a beginner in weightlifting.)
4. Procuro aulas para iniciantes de yoga. (I am looking for beginner yoga classes.)
5. Como iniciante, ainda cometo muitos erros. (As a beginner, I still make many mistakes.)

Portuguese (Portugal) Examples

1. Eu sou principiante na guitarra. (I am a beginner at the guitar.)
2. Este curso é para quem está a começar. (This course is for those who are starting.)
3. Ele é um principiante no ginásio. (He is a beginner at the gym.)
4. Procuro aulas para principiantes de ioga. (I am looking for beginner yoga classes.)
5. Sendo principiante, ainda tenho dificuldades. (Being a beginner, I still have difficulties.)