Both are - Very attentive to detail - Diligent - Thorough
The main difference Scrupulous is this way because of morals.
Tom is a meticulous person, he believes that the death penalty is wrong. Today, Tom had to arrange all the documentation for an execution. Despite his dislike of the law, Tom did the perfect job that is expected of him.
Dave is a scrupulous person. He believes the death penalty is wrong. Today, Dave was told to arrange all the documentation for an execution. Even though he is an amazing and meticulous person at work, Dave refused because he does not believe in the death penalty. Dave held to his scruples.
@MaxineWolph Thank you so much for detail explanation. Can I ask some questions? What is "if" in Despite his dislike if the law? Is is a typo? Is Dave a criminal? Is he sentenced a death penalty? Thank you in advance.