Maybe, but that first screenie is definitely not 16 color EGA. Look how many shades of red are present in the engine (?) as compared to the skilful dithering in the original version.
The shades are coded into the vector graphics. When you capture the graphics with an interpreter that is not restrained by the hardware limitations that existed back in 1989, things come out that were drawn but were not reproducible at the time, such as the shades of a main tone being reproduced in flat colours instead of dithered ones. And this is an improvement, for the shading info was already there, it was just not viewable at the time, and it is now.
This is a remake, it is not a carbon copy of the original, nor is the final objective of this game to simply provide SQ3 with a point-n-click interface. The aim is higher and if all goes well it will become a full colour remake. But in the meantime, as long as the author doesn't find someone skilled in background art to help bring SQ3 into fully new colorized screens, these bonus his-res renders will suffice to keep work flowing.
So what really should be in discussion here is the availability of volunteers to help with the art remake and not the resemblance between these graphics and the 1989 EGA version ones.
For the die-hard EGA fans this is not the remake to look for, you can type your way through the original SQ3 anytime you want.
In conclusion, beloved artists out there, do lend a hand if you may, SQ fans will appreciate the effort