How to identify Pickup?

[Ebbi]

Hi colleagues,

does anybody know how to reliably identify the DiMarzio PAF Pros of a JEM777SK?

Background:

Many years ago I replaced the two humbuckers, but for the 20th anniversary of my guitar I want to have everything genuine and original again.
Unfortunately I only have one PAF Pro and don't know where the other one is.
Now I need to get a second one, but I don't know which.

The only text the pickup has on its back is

     F
  DiMarzio
Made in U.S.A.

Is there a way to determine if it is a neck or bridge pickup?
Or does it make no difference and they're identical?

Thanks and regards,
Ebbi