“The British gave ships from the CSA the same rights as Union ships.”

That means Union ships could use certain British facilities. That also means that Confederate ships could use certain British facilities.

“permitted the rebs to attack Union ships across the globe.” Said arrangments also permitted the damnyankees to attack Confederate ships across the globe.

When you treat both sides the same way, you are neutral. UK treated USA and CSA same way. Astute move on their part.