Well at least for the first 1.4 GW, yes. Also there is some nonzero transmission loss so that needs to be taken into account.
The cable can move electricity from the UK to Denmark too btw, so some of the price surges in the Danish region could get damped because the UK will start exporting electricity and the additional supply will bring down the price again.
NordPool market zones are crazy and some zones see insane price surges when demand prices for neighboring zones are high.