Are the koxx saddle seatbases the same as kh ones?

Are the koxx saddle seatbases the same as kh ones? Will a cf kh seatbase work on a koxx?

Yes and yes.

“some parts like handle and baseplate are equally.” While comparing the Koxx seat to the Kh saddles.

From this page
http://www.einradladen.net/catalog/product_info.php?cPath=8&products_id=254&osCsid=928502c7dcb5c98ed98e0f0f3cd8c900

Hope this helps,
AndyC