SENSITIVE OPERATION ON MY BASS

The following was posted on Facebook my Naythan Thorpe. Anybody have an answer?
Technical question. I’m gonna put a p pickup in my Ibanez. I’m going to have to route out some of the body and maybe even some of the neck depending if I place the pickups in the “correct” place. Pictured both the paper p and my j pickup are 5cm toward the bridge from where they should be. My question is, would it make a that much of a difference having it 5cms off or should I move everything up and have it them in their proper position? Moving them toward the neck I will have to do some sketchy stuff.