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

No

The difference between the two lies in spelling and pronunciation.

• Spelling: In Brazilian Portuguese, the word uses a circumflex accent (econômicas) to indicate a closed vowel sound. In Continental Portuguese, the word uses an acute accent (económicas) to indicate an open vowel sound.
• Pronunciation: Because of the different accents, a Brazilian will pronounce the "o" as a closed vowel (similar to the "o" in "low"), whereas a Portuguese person will pronounce the "o" as an open vowel (similar to the "o" in "hot").
• Usage: While the meaning is identical, the verb associated with "saving money" differs. Brazilians typically use economizar, while the Portuguese naturally use poupar.

Brazilian Portuguese Examples

1. As passagens aéreas mais econômicas são as melhores. (The most economical flights are the best.)
2. Ela sempre faz escolhas econômicas para a casa. (She always makes economical choices for the house.)
3. As medidas econômicas foram aprovadas ontem. (The economic measures were approved yesterday.)
4. Estas lâmpadas são muito econômicas. (These lightbulbs are very economical/energy-efficient.)
5. Existem várias estratégias econômicas para economizar dinheiro. (There are several economical strategies to save money.)

Continental Portuguese Examples

1. As passagens aéreas mais económicas são as melhores. (The most economical flights are the best.)
2. Ela faz sempre escolhas económicas para a casa. (She always makes economical choices for the house.)
3. As medidas económicas foram aprovadas ontem. (The economic measures were approved yesterday.)
4. Estas lâmpadas são muito económicas. (These lightbulbs are very economical/energy-efficient.)
5. Existem várias estratégias económicas para poupar dinheiro. (There are several economical strategies to save money.)