'"Exists" keyword with false positive result - Robot Framework with Sikuli

The "Exists" keywords is it assertive?

I added this keyword in my test (the objective is failed test, because i put a different image of the displayed screen), but the status is passed!

Which of these keywords is better to validate?

"Exists" or "Screen Should Contain"?

Is there a keyword where I validate the text presented on the screen with the text I send?



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