I have changed
Mejor el mío, que lo he cambiado hace poco.
Mine is better; I replaced it recently.
— Un Taxista (2017)
I changed the baby’s diaper.
I've changed my mind.
Iba a ir a Boston la próxima semana pero he cambiado de idea.
I was going to go to Boston next week, but I've changed my mind.
He cambiado totalmente la frase.
I've completely changed the sentence.
I know I've changed.