Now IF poser finds another magnet, with the same name  already present in the scene , then it will change the imported magnets name.

It is like loading a second figure with the same name, or a second prop with the same name.

Ball
Ball_1
Ball_2
and so on.
A Magnet is just another prop, nothing more, nothing less. it just has 3 parts.
Mag, Magzone and Magbase.
So you will have to rename all 3.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!