Thanks Trevor. Strangely both effects are indeed Sketch>Halftone, for some reason when applying to the purple colour it forms circles, and the other colour produces squares, even though both are set as 'dot' with full contrast. So it looks like I never had a choice about which one it was. As I mentioned in my reply to R_Kelly, my mistake was in assuming that I had created the previous artwork in CMYK from the beginning, whereas it must have been RGB, therefore allowing access to the Sketch filters. Thanks both of you for your quick replies.
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