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I dunno it's probably similar. No doubt you can find out for your exact dates.
I think wkw is just more of a holiday overall, better food and drink options, definitely doable in 4 days just using hostels so you don't have to ride sleeping kit up and down hills and because it's coastal it feels a bit more like a break. It's reported that it drains better too. Kaw is nice, but we really had a time with the mud 2 years ago in July and I didn't feel like the accommodation or food stops were as good. Your mileage may vary depending on your preferred levels of comfort and fitness. Mine are relatively high and low respectively.
West Kernow Way is amazing if you can get out there. Recommend it over kaw. Night train to Penzance so minimal holiday usage.