This new Tarkin 2pk Vader comes with the wrong lightsaber (wrong grips and should not have the wires) and the belt should not have the silver dot on it. Both of those seem to be from the upcoming ESB version. It does however have the weathering on the belt buckle and the belt light boxes that are more screen accurate and was missing on the 1st ANH version. Both of which are from the RO version. The chest box is more the proper size, which is the RO version, but the slots are too small and more accurate on the ANH version. And of course the new hands/gloves from the RO version which look better without the separate flap/hand sculpts from the 1st ANH version. Also the shoulder bells on the Tarkin version are all black which is wrong. The 1st ANH version they are correct as grey and black.
Not sure if I've missed anything.....
So, you must choose which errors are less of an annoyance to yourself.
Or buy the new one, and look for loose parts on ebay from the ANH version to fix this one. Problem would be you can't replace the lightsaber from the lite up arm, as it's not removeable, and if you buy the ANH lite up arm it has the different hand and flap that won't match the other hand.
I think that covers it all as to what's right or wrong, versus what looks better..