Well, I finally did it! It was exactly as I thought, just a swap. I removed the rear bumper cover and then removed the tail lights. Pulled the LED unit/board out and turned on the parking lights. They illuminated red!! I was excited!
So I continued with swapping the LED units into the new tail lights and then reinstalling the bumper and miscellaneous clips and trim pieces. It really wasn't as bad as I was expecting. I took a few pictures with my cell phone - will be posting soon!