GeForce 310.70 WHQL drivers are now available to download. The culmination of our recent beta releases, these WHQL-candidate drivers improve performance by up to 37% in the year's most popular games,... Download GeForce 310.70 WHQL
Probably because the old was international version. Even though it was labelled English at Nvidia site, it was linked to intl. version. The English WHQL properly links to English version.
I assume version numbers don't lie, so this .70 is the same as the previous .70. (The included physx is the same ver too.)