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

No.

While the spelling, grammar, and core definition of "planos" are identical in both Brazilian and Continental Portuguese, there is a difference in typical usage. In Brazil, "planos" is the standard term used when referring to health insurance or mobile/data subscriptions. In Portugal, while "planos" is understood, speakers more naturally use "seguros" (insurance) or "tarifários" (tariffs/plans) for these specific contexts. Additionally, there is a significant difference in pronunciation: in most of Brazil, the "s" is pronounced as a soft /s/, whereas in Portugal, the "s" at the end of a syllable is almost always pronounced as a "sh" sound (/ʃ/).

Brazilian Portuguese Examples

1. Quais são os seus planos para o fim de semana? (What are your plans for the weekend?)
2. O meu plano de saúde é muito caro. (My health plan is very expensive.)
3. Eu preciso mudar meu plano de dados. (I need to change my data plan.)
4. Eles têm grandes planos para o futuro. (They have great plans for the future.)
5. Os planos de ação foram aprovados pela diretoria. (The action plans were approved by the board.)

Continental Portuguese Examples

1. Quais são os teus planos para o fim de semana? (What are your plans for the weekend?)
2. O meu seguro de saúde é muito caro. (My health insurance is very expensive.)
3. Eu preciso mudar o meu tarifário. (I need to change my tariff/plan.)
4. Eles têm grandes planos para o futuro. (They have great plans for the future.)
5. Os planos de ação foram aprovados pela direção. (The action plans were approved by the management.)