Does Pitraloka change for different people?

From: pritha saha

hare krsna.my question is:in your audio lecture you have mentioned that if a person does average good karma,then a person goes to pitriloka where his ancestors resides.if the person’s grand-father or grand grand father got transferred to swargaloka or any other planets according to his karma then is that loka becomes the pitriloka for that person or the pitriloka is completely an another planet??what will be the pitriloka for that person i mentioned earlier?please explain.