Are their basically two variations of this flight deck - one like a CRJ (6 tubes in pairs of 2, NOT like a 604) and one with only glass HSI and ADI? In researching www.airliners.net I see pictures of 601-3Rs with two different cockpit setups - one like a CRJ and one with only glass HSI and ADI. Trying to see what I'm getting into here. Thanks!