My guess, and only a guess, would be the green is a 2nd printing, blue later printing.
Thank you Peter for expressing your thoughts on the Subject. Before I comment any further I would love to hear from any other members with their thinking on the subject/.
I have just realized that I had posted a thread here on the forum in September 2016 titled The Enemy Below that had slipped my mind having previously done this. I will now repost this thread that covers all of what I was going to include here shortly. I am thinking that there is a W.E.Smith first printing daybill that is possibly similar to the Australian one sheet in having the film's title printed in yellow, Please check it out and let me know your thoughts.
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Peter
Peter