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

No

The difference lies in spelling and typical usage. In Brazil, the English-derived word "stress" was adapted into Portuguese with an added initial "e," resulting in the standard spelling estressado. In Portugal, the English spelling is preserved, making stressado the standard form. Additionally, natural usage differs in grammar (the use of você in Brazil vs. tu in Portugal) and vocabulary (using bobeira in Brazil vs. parvoíce in Portugal).

Brazilian Portuguese Usage

1. Eu estou muito estressado com o trabalho. (I am very stressed with work.)
2. Ele fica estressado quando tem muita coisa pra fazer. (He gets stressed when he has a lot to do.)
3. Não fique estressado com essa bobeira. (Don't get stressed with this nonsense.)
4. O trânsito me deixa muito estressado. (Traffic makes me very stressed.)
5. Ela é uma pessoa muito estressada. (She is a very stressed person.)

Continental Portuguese Usage

1. Eu estou muito stressado com o trabalho. (I am very stressed with work.)
2. Ele fica stressado quando tem imensa coisa para fazer. (He gets stressed when he has immense amounts of things to do.)
3. Não fiques stressado com essa parvoíce. (Don't get stressed with this nonsense.)
4. O trânsito deixa-me muito stressado. (Traffic makes me very stressed.)
5. Ela é uma pessoa muito stressada. (She is a very stressed person.)