Both html's are lightly modified versions of FC released in sync with upstream;
One is just a set of patches to allow for older browser support and another to reverse the WebGL censorship.
The other (as the title might hopefully suggest) reverts the RA Editor back what it was previously while also including the above changes due to how the process is executed.
Though why are there two "revert RA editor" files?
Because it follows the trend of the other .html where both the current and previous file is kept.
WebGL censorship?
Summary: If the slave is under 18 they will wear white panties instead of being naked and height of the rendered image is clamped to 140mm.
Discussion: #3468 MR: !10430 (merged) Reversal guide: #3676 (closed)