I really like DCL so I do not want to criticise him unduly.I would say, as goalscorers they are similar now. Kane is the better all round player, as you would expect from someone who is 28 over 23.
I doubt Calvert Lewin will reach the heights Kane did, but moving forward, as of today, they are similar. A 25 year old Kane is a better goal scorer than this DCL.
However in my opinion Kane has by far better control , vision , appreciation / awareness of other players , finishing ability , shooting ( especially but not exclusively free kicks) and leadership.
I think DCL is an extremely promising player , with a brilliant attitude , good aerial ability and excellent athleticism with the strong possibility of further improvement.
I am delighted that DCL plays for us but would swop him for Kane in a heartbeat.
However football is all about opinions is it.