Yep - but we do also sell 8-pin PCI-E separately so you can have the three total.
https://www.amazon.com/dp/B08GJPYMWR/?th=1
More from our US store: https://usstore.cablemod.com/products/?filter_series=e-series
Majority of cards are 2x8pin which is why the kits include two, however, we do sell single cables separately. You can find that here: https://store.cablemod.com/product/cablemod-e-series-pro-modflex-8-pin-pci-e-cable-for-evga-g5-g3-g2-p2-t2-600mm/
These are also available on Amazon as well, here: https://www.amazon.com/dp/B08GJPYMWR
You could use your stock EVGA cable with the two from us though, totally fine to do that since the compatibility of the cables is the same, and ours are just sleeved as the difference. Fully normal on the mobo connector as well if it's on the PSU side that you're referring to. :)