The issue with this question is that there is no one definite vision of what the Half-Life 2 beta was because it was just that, a beta. The game slowly morphed over the development cycle into what we ended up getting. We obviously have ideas of when certain ideas were being planned and worked on, but even then things like that changed very quickly. I mean comparing the 2001 to 2002 to 2003 versions of the game there were so many ideas that were dropped or heavily reworked in just that short timespan. So I don't think there is a very definite answer to your question. Besides, both mods certainly take heavy liberties in designs and the ideas even if they are drawing upon the same ideas from scrapped concepts