Special hobby have been threatening to release this in both scales for years. The difference is the first release the serie 46 is the lloyd built c.v and the 85 is the w.k.f. built. Theres a different engine so the cowl is different ad well as the control panel and othet minor interior and exterior differences. Austro hungarian serial numbers seem strange but give you clear indication of manufacturer. In its simplest for a serial starting with 1 is lohner 2 is phonix 3 aviatik and 4 lloyd etc. Although things get a little tricky when a 3rd digit comes into play ie seri 129,229,329 and 429 are all p;onix built hansa c.1 2 seaters. See " austro humgarian army aircraft of world war one" for in depth discussion.