I believe EricV was talking about setting cam timing when removing the cams to set valve clearance, not adjusting timing.
That was markjenn, and you are correct.
Most of the twin cam motors I've seen had factory marks for cam timing alignment for both exhaust and intake on the same cam sprocket. Same part for both camshafts. Just different dowel pin alignment on the end of the camshaft.
I once had a customer tow a Miata in to my shop that wouldn't run. He had done his own timing belt change and replaced some HLAs during that process, requiring the removal of the camshafts. Everything was lined up just fine at the cams, but the car wouldn't start or run.
He had installed the cam gears and set them to the timing marks with the engine out of phase. I asked him a lot of questions once I realized what work he had done himself. After that I just checked the crank timing marks and pulled the belt off to re-set things. Non-interference engine, luckily for the owner. No damage and it fired right up.