Here is a pic of one of the ridges on the ceiling.
that is a orange peel texture. looks like a medium one at that it is a sprayed on texture. then primed with PVA then top coated.it looks like there is a texture to your ceiling. im not totally sure type of texture that is, looks kind of like something paint with a really heavy pile roller and put about 20 coats. good luck matching that texture maybe somebody else on here as an idea how on to get that finish.