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What kind of subfloor will you have on the ZPurlins?
Z-sections have one broad and one narrow flange allowing the two sections to fit together snugly, making them suitable for lapping.
With your Structaflor Red Tongue 3600x900x22mm subfloor, your floor will be flat enough that you will not even notice the very minor overlap.
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Z-sections have one broad and one narrow flange allowing the two sections to fit together snugly, making them suitable for lapping. That means that the narrow flange will nest inside the broad flange.
In my opinion, the 1.9 mm will not be noticeable over an approximate 250 mm distance, under your subfloor.
I will send a message to customer service to process a deposit refund.
Good Luck with your project