wagetypes in Infotype 8 and Infotype 14

Hi All,
i would like to understand the difference between wagetypes in infotype 8 and infotype 14?
In our system landscape, we have a few wagetypes for allowances which are currently maintained in Infotype 14.
Can anyone please explain the difference between maintaining a wage type in infotype 8 and infotype 14?

what are the implications of moving a wagetype from infotype 8 to infotype 14?
Is there any way to distinguish between wagetypes that are pensionable and non pensionable?

Regards,

PK