I figured that's what the four holes in the former are for.
The Evo manual makes no mention of extra cooling for the rear end of the fuselage.
I suppose the current manual is kinda written for people who have put together Classic Flash and pre-Evo Ultra Flash airframes in the past, as it is rather skinny IMO.
I'm not a "seasoned" jet flier, so I tend to (over)think about everything 😋
I did find a manual on the internet for the pre-Evo ultra flashes, that does mention the NACA ducts.