Variables in the find text are not evaluated.
Many thanks, that's the unequivocal answer I was looking for.
I'll continue to set up different 'Find...' snapshots, for different file types.
Use GraphicConverter who find duplicate pictures even if they have different names and locations.
This answers an unasked question
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I have an old version of GraphicConvertor that I keep for two specific tasks, I never realised it did this. After a quick play it seems to work well and may be very useful in the future - thank you.
There is a clever workaround for this described by our Tech lead in this video
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Thanks for this, it's a technique I've taught to others, before I discovered PM's 'Find...'.
However, I do feel using a find string of "A.jpg B.jpg C.jpg" is quicker and more efficient (the video demonstrates using individual passes of "A.jpg" followed by "B.jpg").
Thanks again to Kirk, Soizic and MickO for taking the time to respond to my query.