I took the orange saber from finishing the origin world, bought a similar one, much higher level off a vendor on Tatooine, and ripped out the mods, stuck em in the newbie one, and it was identical to the ones on the vendor. So i don't see that the "base level" has any bearing.
Planning to verify this again with a pair of boe oranges i have on my sniper. One level 11 chest i picked up off the galactic market, and a level 31 that dropped on my quiz. Though i suspect the results will be the same there, unless weapons and armor don't behave the same.