My concern is not with the entire genealogy in Matthew, I just checked to see if the first part matched 1 Chronicles 3 and it does. Im sure the rest of it does too but that's not the point of my research right. Right now I'm interested in understanding the Ahaziah's age thing.
Because if details were your concern, you would never leave your searching for how to reconcile inner KJV readings... thats why you must do just "quick checks" and hope the rest is OK. It saves you time for normal life. On the other hand, it can always return back to you so you are never truly in the finish.