Can i replace the standard Eberspacher Easystart Pro controller with this Eberspacher MINI controller? If so is it an easy swop?

This would be an unusual swap out, and unfortunately not possible to swap an Easystart Pro with an earlier generation Eberspacher mini controller. Perhaps if you are wishing to install a simpler to operate controller take a look at Easy Start select, or perhaps an Eberspacher 802 controller

https://www.butlertechnik.com/item/Eberspacher/Easy-start-Select-controller-Airtronic-or-Hydronic-heater-221000341300/6SE

but you will sacrifice a lot of functionality if you swap to these controllers.

Let me know