2003 Dodge intrepid 2.7 engine cam tone ring swap question?

I am converting a 2000 2.7 engine to go into a 2003 Dodge intrepid so
far I have replaced the the flex plate so that it is compatible. The
question I have is the about the cam tone ring. If the cam tone ring
has to be swapped out in the 2000 2.7 engine, then why would I need to
remove the cam sprocket if only two bolts holds the ring on and it
comes free of the cam sprocket very easy? I ask this because when I
removed it from the 2003 engine, the left cam shaft barely moved and
it seems like I could easily turn the cam shaft back to realign it
with the cam tone ring, and sprocket and the engine would still be
statically timed and there would be no need to reset the timing.

Thanks