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

Yes

The word "atendo" (the first-person singular present indicative of the verb atender) is identical in both Brazilian and Continental Portuguese in terms of spelling, grammar, and meaning. The only difference is pronunciation. In Brazilian Portuguese, the vowels are generally more "open" and clearly articulated, making the "e" in "atendo" easily audible (/a'tẽdu/). In Continental Portuguese, unstressed vowels undergo significant reduction; as a result, a Portuguese speaker may pronounce the "e" so softly that it almost disappears, making the word sound closer to "at'ndo" (/ɐ't'ndu/).

Brazilian Portuguese Examples

1. Eu atendo o telefone assim que ele toca. (I answer the phone as soon as it rings.)
2. Eu atendo os clientes no caixa da loja. (I serve the customers at the store's register.)
3. Eu atendo prontamente a todos os pedidos. (I promptly attend to all requests.)
4. Eu atendo as chamadas de vídeo no celular. (I answer video calls on my cell phone.)
5. Eu atendo as necessidades da minha família. (I attend to my family's needs.)

Portuguese (Continental) Examples

1. Eu atendo o telefone mal ele toca. (I answer the phone as soon as it rings.)
2. Eu atendo os clientes no balcão. (I serve the customers at the counter.)
3. Eu atendo prontamente a todos os pedidos. (I promptly attend to all requests.)
4. Eu atendo as videochamadas no telemóvel. (I answer video calls on my mobile.)
5. Eu atendo as necessidades da minha família. (I attend to my family's needs.)