Thanks, SO.
The Chi-Rho method isn't going to produce results equal to the DMG, for a variety of reasons.
It will produce XP that is scaled to "13 1/3 encounters of your own CR to make a level" and it will ensure XP that are accurately scaled and awarded relative to the challenge posed by any particular creature or group.
In some cases it will award more XP than the DMG, and in some cases it will award less. The table in the DMG, in addition to necessitating a "rounding off" that a purely mathematical method won't do, also incorporates imprecise elements aimed at a particular game design result (ie, flattening, increasing, or decreasing XP in order to "pace" level gain).
Keep in mind that this system had its beginnings in a fresh look at CR and EL as they were originally presented in the DMG, and an overhaul of such, so an adherence to the tables provided in the DMG was never a design consideration. The aim was a "true" calculation of CR, EL, and XP.
If you're looking for a system that is going to mimic the DMG, just use the DMG.
Wulf