Copy all paramters from one fixture to another in the same cue

Sorry for the noob question. Long story short, I need to update a bunch of cuelists (mostly single cue), and I just need to copy the programming / parameters from fixtures 1 and 2, to 5 and 6.
I am unclear if I want Edit or Load for this, and the proper order of operations.
Its not a Clone situation because some of the cuelists are correct aka have all 6 fixtures working / programmed.
I appreciate any help / guidance.

Software Version: latest
NX Console Type or PC OS Version: PC Windows 10, no additional HW (like NX K or Wing)