How can i clone the wordpress theme style?

Hi guys

i have installed a wordpress template and changed some colore style in the frontend for the domain examplexyz.COM
Now i wanna install the same themplate for the domain examplexyz.NET and clone the frontend color styles.

if i copy the style.css not all colors are identical.

Do you know a good addon which i can copy really easy only the color styles for the frontend page?
All the plugins which i have found in the plugin store clone the website completly with all the content but i need only the frontend style.

Thank youn for your help

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