When a GLA becomes a PLD, its like a badge of honor, with perks.
can equip most of the same stuff, but you get new abilities.

The level you are as GLA will not change when you become PLD. ex: 35GLA ---->35PLD
The experience you gained as PLD is automatically part of GLA experience earned.

Translation: unified- same level if core class or job, even if either changes.