These are the two pieces.
The bottom one is the polybutylene inlet, and is labeled "pb2110 sdr 13.5"
The top one says 690 HASTINGS, NE.


They are both called 3/4" but the OD and ID are not  the same.




Here's another view.



This is the original compression fitting.




The new pipe and old compression fitting with markings visible.
The fitting says "FLO-CONTROL BURBANK 3/4" CTS CALIF."
The pipe says 690 HASTINGS, NE.