The fundamental difference between WT chronologists and secular chronologists is that the former give prioroty to the Bible as the innspired Word of God whereas the latter allow higher criticism to put the Bible aside and pay 'lip service' to its testimony. There will always be a conflict between secular records and the Bible record so one must choose which record is the most reliable and accurate especially when it comes to history and chronology.
Celebrated WT scholars as with the rest of the scholarly community are interested in the progress of knowledge particularly in relation to the Bible and as new research comes to light which causes adjustments or confirmation of current practice then such research is utilized for the benefit of all peoples. Over many decades WT scholars have found it necessary to adjucst or 'fine-tune their chronology and this has also been the case with other chronologists. In short, the only difference between chronologists is the attitude to the Bible.
scholar JW
AMEN