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1. All depends on how these plastic details of the kits were moulded. Mostly it is possible to replace them with the PE parts being dedicated to the other manufactures' kits. Just a matter of fitting IMHO. In case of ships you need to pay your attention to the period of the service time. It is because of the modifications that were introduced to the real vessel during her life. For instance a ship launched in 1920 and servicing in 1943 could get the AA armament changed or added new one if didn't have it at the beginning of the war. Also the good example are the masts and the details of devices installed there eg ... the radar systems.
here you are the GMM3506 PE set for the Bismarck / Tirpitz dedicated to the Academy and Tamiya kits.
View attachment 737592
the source: NNT Modell | Bismarck / Tirpitz | purchase online