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What is the difference between 04E905601 and 04E905601B spark plugs?

Hello, someone said that it is not good to screw back the unscrewed plugs. Please advise?

To refresh the topic. Should I change or not the spark plugs on 1.2 tsi 66 KW CJZC engine on 60000 km (38000 miles) or not? The car manifacturer recommends, but fhe spurk plug manifacturer recommends to change double platinum spark plugs on 90000 km. Original spark plug is VW AG 04E905601B, made by NGK. WHO i need to listen? Car or spark plug manifacturer?

Hello to all, I am new at this forum. My name is Dusko Madzar, and I am from Belgrade, Serbia, I own 2016 Seat Toledo 1.2tsi 66kw, engine code CJZC (Skoda Rapid clone) . My car was factory filled with Castrol EDGE proffesional 5w30 (VW 504) for variable service interval, but my local diller change it to fixed service interval on 15000km when they filled Castrol Edge proffesioanal 0w-30 with VW 502 spedification. I also have ticking sound for couple of seconds when I sturt up my cold engine and I have a oil conumtion about 0,8l per 15000km. Dealer told me that it is normal. Now it is my 2nd fixed service interval on 30000km. the same diller offer me again Castrol 0w-30, but the second one is offering me Castrol Magnatec professional 5w-40. My qestion to Maverick54 and to Awayoffski and all others which 5w-40 oil did you use to prevent the ticking sound at cold engine start up and oil consumtion? is the 5w-40 oil enough good to prevent carbon build up on intake valves on TSI (GDI) engines.