I took a closer look. The bikes are so much the same it's uncanny.

The Troll is 9-speed and Ogre is 10-speed in their current form. This wins you a Dyna-Sys RD on the Ogre. Aside from the added (probably useless) 11t top cog on the Ogre the gears are the same, which means that the Ogre's final drive is about 11% higher due to its 11% bigger wheels. Or you can think of it as the Troll having one lower vs. the Ogre two higher gears. Other than that and the wheel/tire size difference, the components are the same.

The geometry is also about the same which surprised me. The wheelbase and length/reach are the same, giving the Troll bigger tire clearances, and which will make their handling more similar than usual between 26er and 29er. The stack on the Ogre is 1.25" higher as you might expect from the bigger wheel, an so it will sit just a little more upright, subject to adjustment.

The price is $1450, plus whatever it costs you to alter and accessorize it to your liking. The frame is $550. You might be able to build a nicer bike from the frame up for the $900 difference. A Deore groupset from Ribble UK is is $318, with better shifters and hydraulic brakes, and everything will have the same label and style. (Or +$90 gets you SLX). That's the price today, they do have sales. Similar machine built wheels are about $180 for a set (search the Amazon wheel category for M525, which will get you the same hubs). Maybe about $100 for tires & tubes - and you get the right tires from the get-go rather than buying and swapping whatever came on the complete bike. Same advantage with the saddle and handlebars, you can have what you think you like from the very start. You have about $300 left for seat and post, bar and stem and grips.