Did a search on any diferences between lovells and kings and didnt find anything.

Are there any real differences aside from the fact kings come in 40mm and 60mm and lovell come in 30mm and 50mm?

Lovells are the more common ones if you want to go Superlow all around. Kings only make them for the front. But you can use the Kings Verada lows for the rear, coz they drop by 50mm ;)

Lovells have historically made a better quality spring as they don't cater so much to the cheap end of the market, but as far as noticeability goes, I dont think youd feel any difference.

Matthius