Rear knuckle replacement?

Hi, I had both rear knuckle, upper arm and coil springs replaced. But after replacement of the parts, I notice that the rear vehicle height has risen some, but compared to when it had the old parts. For sure I know that the coil springs are not original, but it had the same number of coils on it. My query is that can it be only the coil springs that cause height to the car to increase, or can the rear knuckle also have a role to play in increasing the height? Should I put back the old coil spring and see if the height decreases?