Rough textured paint

I am working on re-doing a bedroom in my house for my baby that is currently on the way. The majority of the walls in my house have a rough painted texture. My problem is, when I repair the cracks or holes in the walls with compound and re-paint I get a very smooth area where I plastered but the rest of the wall has a rough texture. The room I am currently re-doing, I tore down 1 wall and re-sheetrocked it. This wall will be smooth but the other 3 walls will still have that rough texture. Wit hthe other walls, I have plastered area that needed it, repaired cracks etc. How can I get the rough texture to be smooth? Additional coats of primer or paint? Below are closeup photos of what I am talking about.










And here is the smooth part of the wall where I compound




Is it possible to get a smoother finish when I re-paint the walls? If not, how can I blend them together so it looks similar?

 

Not going to get that stuff off, you would have to skim coat the whole wall with drywall compound to get it smooth.
All repairs needed to be primed.
I'd try a 1" nap roller when priming and paint to see how it looks.
Just one of the many draw backs to textured anything.

 

What would be the benefit of a nap roller?

Also, I dont think it is an actual textured paint, I think it might have been the original type of roller that was used to apply the paint.

 

That is either textured paint or it's orange peel texture that was sprayed on when the house was built.
Whenever you patch textured walls you need to texture the repair to make it blend in. To make the walls slick you'd need to skim coat them with joint compound, sand, prime and paint. A heavier nap roller cover will hold more paint - I'd use a 1/2" or possibly a 3/4" nap on that texture.