1998 Cadillac Catera stumped on my mechanics work cant put

If you are speaking of the camshafts themselves all looking alike, they could be. Ideally, they should have been marked for reference during reassembly, but that is not too important. What I would do is look for casting numbers or part numbers in the shafts themselves, and see if they are all a match. Then they could be reinstalled in any position. Another possibility is to place them all in the same profile with the cam sprocket locating pins, and compare the position of the lobes. If they are all really identical, then I would assume they are the same. The only other option, is upon finding a cast in part number, and they are different, call a GM parts center and have them run the numbers to decode what they are.