Are multiplayer stacks different between Steam (HD) and original game (Voobly)?

A friend told me that the networking stack was entirely rewritten in the HD version on Steam versus the original version Voobly players play on.

Did the developers rewrote the entire multiplayer networking model? If so, this explains all the crappiness on Steam multiplayer mode.

(Apologies if I got the terminology wrong. I am assuming Steam version cannot be patched to play on voobly.)