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

Yes

The word "delas" is a contraction of the preposition de (of/from) and the third-person plural feminine pronoun elas (them). It is used to indicate possession or origin regarding a group of females (e.g., "their" or "of them"). There are no differences in meaning, spelling, or grammar between Brazilian and Continental Portuguese. The only difference is phonetic: in Brazil, the "s" at the end of syllables is often pronounced as a soft [s], whereas in most regions of Portugal, it is pronounced as a "sh" sound [ʃ].

Brazilian Portuguese Examples

1. As roupas delas são muito legais. (Their clothes are very cool.)
2. O cachorro delas é muito pequeno. (Their dog is very small.)
3. O ônibus delas quebrou no caminho. (Their bus broke down on the way.)
4. O café da manhã delas é sempre saudável. (Their breakfast is always healthy.)
5. As crianças delas estão brincando no parque. (Their children are playing in the park.)

Continental Portuguese Examples

1. As roupas delas são muito fixes. (Their clothes are very cool.)
2. O cão delas é muito pequeno. (Their dog is very small.)
3. O autocarro delas avariou no caminho. (Their bus broke down on the way.)
4. O pequeno-almoço delas é sempre saudável. (Their breakfast is always healthy.)
5. Os miúdos delas estão a brincar no parque. (Their children are playing in the park.)