There is only one knowledge test for the ATP - unless you want both the ME and SE ATP. There are separate writtens for the SE and ME ATP. And while it might make some sense to have to do the ATP CTP and ATM written even if you hold a SE ATP I can see no relief from the SE ATP written for a ME ATP holder.
The ATM (the ME ATP written) is good for 60 months, the ATS is only good for 24 months. And there are no turns on pylons, chandelles and lazy eights on the ATP checkride. Those are commercial checkride maneuvers. The ATP ride is a straight IR ride to higher standards.
Or did I miss the whole point and you are really wanting a FAA commercial with an IR? Then the writtens are good for 24 months as Rudestuff says.