Editor-style.css is not the same a style.css

So I have some authors on my blog that love the WYSIWIG editor because they can see what their post will look like as they go. However, since I changed to the Catch evolution Pro, this is no longer the case. Some of the differences I see are in font size, spacing and font styles in blockquotes, Font size and style in the headings, etc. I do not want to create a child theme, but is there a way to fix this without doing so?