Catching up with you just now Needhope. Mutti3 is correct. You will find your recovery from each knee will be different. Having had both knees replaced (and both hips), I wouldn't worry about one leg ending up a bit shorter or longer. My understanding is very few people, even with all their original "parts" are perfectly symmetrical. Oddly, one of my legs is slightly bigger than the other (!!)

- a fact I would never have known except my OS had to use a larger implant for my left knee than he did for my right. My theory is the right gave out earlier, so my body built up the left more as it took on more of the work.
Regarding the pops and such, as sistersinhim earlier pointed out, your body is making all sorts of adjustments. Remember than as your knees wore down, your body made many adjustments to compensate for what was going on inside. Now it is having to adjust to the "new normal" - you working to be tall and vertical again. Give it all time to realign ... it will. So glad they aren't painful snap, crackle, and pops!
On the actual knee pain, as many of the articles here will tell you, so much is due to the swelling from all the construction work done in such a small area ... and it sounds like you had more done than most of us! I took the gravity theory of elevating to a new level and often laid on the couch with both feet up on the wall and read, just to help the fluid seep through the construction zone of my knees! Additionally, a friend who is a massage therapist, did some
gentle lymphatic massage to help move the fluids through, starting below the knee and working up my legs. While it did not relieve all the pain (healing itself causes pain), it dramatically reduced the swelling, such that my OS remarked on how little I had at each of my 3-week appointments. Moreover, my muscles loved it!
Wishing you well.