People keep talking the lineout here, and while I would say Kruis is a better option, having more jumpers isnt necessarily a key to being better in the lineout
Offensively it will help, for sure, but England could call 5 or 4 man lineouts, and completely negate the point of having 4 jumpers, as well as being more about where you jump in relation to your opposition jumper, whether you can use decoy jumpers to move their contestable lifters and jumpers (and lifters are just as important). Kruis is a better lineout operator as he reads the lineout better, not because he jumps higher, but Borthwick will have a plan in place for this area.
I'm not saying New Zealand dont have an advantage, because they do, but England can be canny about their Jumpers in order to stay secure.
In summary, its more important to be jumping just in front, or well behind your opposition jumping pod, than simply being taller (though this helps for sure)
One issue last year in the second half was the overuse of Itoje jumping at the front, which is where i think 2/3 of the losses came, its an easy place to contest if you're not showing threats to take the ball off the tail or the middle.
On top of this I think Jamie George is one of, if not the best Lineout thrower in the world right now, given the variety of ways he can hit any position in the line, looping, arrowing it in, etc... he's absolutely brilliant
That said given the likely heavy kicking plan of England (either crossfield or into touch) the Lineout will be crucial, and England will target either perfection or maybe the loss of 1 lineout, 2 at most. More importantly, they must provide some pressure on AB's ball, if they can nab one or two with intelligent jumping, I think England will win this game