I don't know why it couldn't/ shouldn't be posted here.
We have a very good example and reason that cam and lifters should be replaced together
Years ago, we were shipping one of our upgrade Stage II ALH cam and cam follower set to a customer. Only problem was, we sent a new AHU cam. The slot for the vacuum pump is not wide enough, So, the mechanic installed the cam followers, which work in either engine, and put the old cam back in. I knew the customer had to drive very close to my house and I offered for him to stop by. I'd put the cam in at no additional cost.
The car came in after about 1500 miles, To my dismay, the cam followers were damaged exactly as they had been on the old lifters. Each new cam follower had exactly the same markings as previous lifters created, from the same bore. We ditched the newly installed lifters, put in a new set with the new cam
Cam and lifters are installed as a set. They wear in together and they wear out together. For a little bit of savings on the cam, it is not worth it.