I had a 01 Jackson SL1 that I regretably sold about 4 yrs ago. Now I want to get another one. Is the humbucker, TB4, thats in the current SL1 the same pick up that was in my 01 model? And if so how long has that pick up been in the SL1. Also while I'm at it, is there any difference between the Jacksons now and the pre fender jacksons?