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

No

While the spelling and the literal dictionary meaning of "conexão" are identical in both Brazilian and Continental Portuguese, there is a difference in typical usage and pronunciation.

In Brazil, "conexão" is a versatile, everyday word used for a wide range of contexts, including the internet, transportation (flight connections), and emotional or logical links. In Portugal, however, the word is much more specialized; it is often reserved for technical, scientific, or computing contexts (such as a "database connection"). For most common situations involving internet, telephone, or interpersonal links, a Portuguese person would naturally prefer the word ligação.

Additionally, the pronunciation differs significantly. Brazilian Portuguese features more open, resonant vowels and a melodic, syllable-timed rhythm. Continental Portuguese uses more closed vowels and a stress-timed rhythm, which makes the unstressed syllables sound much shorter or almost disappear.

Brazilian Portuguese Examples

1. A minha conexão de internet está muito lenta hoje. (My internet connection is very slow today.)
2. Senti uma conexão imediata com aquela pessoa. (I felt an immediate connection with that person.)
3. A conexão de voo em São Paulo vai demorar muito. (The flight connection in São Paulo will take a long time.)
4. Não existe uma conexão clara entre esses dois fatos. (There is no clear connection between these two facts.)
5. Verifique se a conexão do cabo está bem firme. (Check if the cable connection is firmly in place.)

Continental Portuguese Examples

1. A minha ligação à internet está muito lenta hoje. (My internet connection is very slow today.)
2. Senti uma ligação imediata com aquela pessoa. (I felt an immediate connection with that person.)
3. A ligação de voo em Lisboa vai demorar muito. (The flight connection in Lisbon will take a long time.)
4. Não existe uma ligação clara entre estes dois factos. (There is no clear connection between these two facts.)
5. Verifica se a ligação do cabo está bem firme. (Check if the cable connection is firmly in place.)