Video Enhance AI: New version H.264 or H.263

I tested rendered a video to h.264 and it ended up being 24GB while from the old Video Enhance Version 1.3.8 i rendered the same file to 4.5GB.

24GB is simply not sustainable, so my question is rendering in the new version of topaz setting the renderer to h.263 is the same as rendering HQ in version 1.3.8?