Would i have to adjust truss rod ect on firstly a prs se singlecut and secondly a ibanez with vintage style trem

^agree , but if the vintage tremolo tilts up, you may want to tighten the springs in the back
truss will be fine. You might have to adjust the trem.
"There he goes. One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die."-Duke
Quote by Steve The Plank
No, you should be fine with simply replacing the strings.

intonation might be off due to different string tensions. so check that too
Main gear
  • ESP Eclipse II Standard (BK Cold Sweat)
  • ESP Horizon NT-II Standard (SD '59/JB)
  • Marshall JVM 410 Combo
This is why I love hardtails.

My Rig ;D
Ibanez RG550XX 20th Anniversary
Epiphone Les Paul Standard
Crate V50-112 (Modded)
Roland Micro Cube
Lovepedal Purple Plexi 800
Lovepedal Pickle Vibe
Ibanez TS-9
Boss DD-3
Dunlop Crybaby