A very complex area of research, Cathy. I've just spent the past couple of hours going through a whole host of Australian, European and American catalogues, archive etc. I don't think it has changed my thinking beyond what I came up with some years back!
In 2000, we published an article about the United States Glass patterns that had been copied or in some way, "appeared" elsewhere (with an emphasis, of course, on Carnival Glass). The "Rising Sun" pattern has (in my opinion) been reproduced (either using US Glass moulds or new moulds) in Argentina. Another example of an Argentinean repro is the US Glass Omnibus pattern.
The Crown Crystal piece you have just found, Cathy, is most interesting. In the colour that you have found it.....it really would add plenty of weight to it being a CC item. It's such a complex mould, with its three handles, that it surely has to have been the original US Glass one that somehow crossed the oceans to Australia. Only the one shape in that pattern is shown in the Crown Crystal catalogues, as far as my studies allow me to understand.
The Crown Crystal catalogues present a very complex situation for the researcher. There are undoubtedly items in there that are other manufacturer's items. Imperial's Starflower and Crucifix candlestick, for example. I can also see Walther, Brockwitz and Rindskopf pieces. Are they copies? Did Crown buy moulds? Or did Crown Crystal simply import some stock items and mix them in with their own glass output?
Probably all three.