NZC has existing in country processing options and as far as I...

NZC has existing in country processing options and as far as I know CLA doesnt, so you would need to factor in export/shipping costs. I'd suggest you read through their sales assumptions. Also worth looking at their mining and processing costs for Stage 1 and try compare to CLA as a best case scenario

https://www.asx.com.au/asxpdf/20171016/pdf/43n7yy1x3hdlpl.pdf

Payables - page 13-15. The table on page 15 specifically and remember for NZC
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The Project will produce two copper-cobalt concentrate products; a DMS product containing 15% copper and between 0.3%- 2.5% cobalt and a Spiral product containing 4-8% copper and between 0.3%-2.0% cobalt. Marketing studies have considered selling options, transport costs, off-take sales pricing/pricing mechanisms, product quality, marketing risks and opportunities. Discussions with Marketing Agent Traxys and potential purchasers at Kolwezi and Lubumbashi support the demand, product pricing and in-country sales approach.
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They also give their OPEX costs for stage 1 (minus any roasters/leach etc) on page 12.