When I scanned the build kits they looked identical - same drivetrain, wheels, tyres, dropper, finishing kit. And Whyte have said it is exactly the same frame so as far as I can see the ONLY weight differences are fork/shock/carbon rear triangle. That's 1kg give or take. And the 160 bike has as 29er rear wheel and tyre which will be heavier than the 27.5 on the EVO which will offset some of that.
I can't see how the 160 is going to be any lighter than 23kg. (Edited - 23kg not 22)
You could swap parts to save weight yourself - the DT Hybrid 1900 wheel set weights 2200g while their DT EXC 1500 is 1800g. Take off the DD rear tyre and replace with an EXO+ or a Conti Enduro casing would be another 100g or so. It'll probably come with a cheap saddle that won't be that light - could save another 100g or more there. The Maven brakes are heavy - 380g per end. Hope or Shimano XT would save maybe 150g? Theres a reason Amflow fit the Magura at c250g!
That would get it towards 22kg (edited 22kg not 21) without sacrificing performance or toughness but it's a chunk of cash.