The original "HD Package" added some of the same channels that are now in [email protected]
plus all the HD channels from the AT packs. HD For life does not add channels such as Palladia for example. However before HD For Life the only way to get AT pack channels in HD was the "HD Pack"(Platinum) which added additional HD channels like Palladia and the doomed Voom channels.
Along the way there were some short-lived packs like the metal packs (Silver, Gold), which were HD versions of the AT packs.