I see two ways
1) Update FAS3160 to 8.2.2P1, head swap to FAS8060, update to 8.2.3P1.
2) Update FAS3160 to 8.2.3P1, prepare/update FAS8060 to 8.2.3P1, head swap
So I will update FAS3160 in both cases. It is NDU so it can be done before head swap as preparation.
The point is that I will not need second update on the live system if I'm able to prepare FAS8060 beforehand.
So in this light... can I prepare FAS8060 beforehead without disks to be ready for head swap safely? Because I'm not sure if you said that it is possible or not. You say that the second step needs disks...
Thanx for clarification