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

No

While the word "compartilho" has the same spelling and the same core meaning (the first-person singular present indicative of the verb compartilhar), there is a difference in typical usage.

In Brazil, compartilhar is the standard and most common verb used for sharing everything from digital content (social media) to physical objects or feelings. In Portugal, while compartilhar is understood, the verb partilhar is much more natural and frequently used to express the same idea. Using compartilhar in Portugal can sometimes sound more formal or specifically related to "compartmentalizing" something, whereas partilhar is the native go-to for sharing information, posts, or experiences.

Brazilian Portuguese Usage

1. Eu compartilho este post no Instagram. (I share this post on Instagram.)
2. Eu compartilho a minha felicidade com todos vocês. (I share my happiness with all of you.)
3. Não compartilho notícias sem antes verificar a fonte. (I don't share news without first checking the source.)
4. Eu compartilho o apartamento com dois amigos. (I share the apartment with two friends.)
5. Sempre compartilho as minhas experiências de viagem. (I always share my travel experiences.)

Continental Portuguese Usage

1. Eu partilho esta publicação no Instagram. (I share this post on Instagram.)
2. Eu partilho a minha felicidade com todos vocês. (I share my happiness with all of you.)
3. Não partilho notícias sem antes verificar a fonte. (I don't share news without first checking the source.)
4. Eu partilho o apartamento com dois amigos. (I share the apartment with two friends.)
5. Sempre partilho as minhas experiências de viagem. (I always share my travel experiences.)