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

Yes

The word "terça" is identical in meaning, spelling, and grammar in both Brazilian and Continental Portuguese (where it is commonly used as a shorthand for terça-feira, meaning Tuesday). The differences are strictly phonetic. In Brazilian Portuguese, the vowels are generally more open and the pronunciation is more nasalized. In Continental Portuguese, the vowels tend to be more closed, and the "r" sound is articulated with a different tension.

Brazilian Portuguese Examples:

1. A gente se vê na terça. (We'll see each other on Tuesday.)
2. Você vai na terça? (Are you going on Tuesday?)
3. A entrega chega na terça. (The delivery arrives on Tuesday.)
4. Tenho muito pra fazer na terça. (I have a lot to do on Tuesday.)
5. Vou na academia na terça. (I'm going to the gym on Tuesday.)

Continental Portuguese Examples:

1. Encontramo-nos na terça. (We'll see each other on Tuesday.)
2. Vais na terça? (Are you going on Tuesday?)
3. A entrega chega na terça. (The delivery arrives on Tuesday.)
4. Tenho muito para fazer na terça. (I have a lot to do on Tuesday.)
5. Vou ao ginásio na terça. (I'm going to the gym on Tuesday.)