Difference between text and language

Hi, I show a spanish serie and I want to progress in english, so i select the english language and i select also the english subtitle; Unfortunatly, the text is different with the language. It s very complicated to progress in thoses conditions. Could i have exactly the same words in text and language? Thanks for help

Lo mejor es mirar una serie ingles entonces los subtitulos suelen corresponder bastante bien (pero no perfectamente)