I've not tested it, but I also think that you wouldn't be able to properly add any existing image files named like that to Sigil on any platform--including Linux. Sigil wouldn't know how to manifest it properly. I'm guessing it would end up manifested as text/plain and show up in Misc rather than Images.
You'd have to rename *.jpg files to your *.09_jpg preference only after they've been successfully added and manifested as image/jpeg in the opf.
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