When using Divi, if you want to transfer individual pages from one website to another, you can use the page portability feature.
Open the page you want to export in your WordPress backend and click on the up and down portability icon in the purple bar in the top right of the Divi Builder.
Give your page layout a name and click the blue Export Divi Builder Layout button.
Next open a new page in the website you want to import the layout into and ensure the Divi Builder is active.
Click the up and down portability icon again as you did when exporting. The click on the Import tab.
Select the layout you saved from your computer then click the Import Divi Builder Layout button.
That's it, your layout will now be on your new page, remember to save the page!