Resoling only replaces the hard outer traction sole, doesn't affect the lining or "shock absorbing materials". Done mainly on good fitting boots in great shape to restore nice sharp tread for traction, especially for edging.
If by heel pain you mean blisters, likely the lining is worn and resoling won't help. Excessively worn soles can cause alignment issues and a deeper pain, if that, resoling may help.
Shock absorbing talk is mostly marketing, your feet have a far superior shock absorber in their fatty pads. You just need a good boot fit to allow the foot's natural (and amazing!) engineering to work. Feet vary more than manufacturers and retailers like to admit, and boot fit is by far the most important factor for comfort. Other peoples recommendations for a good boot are irrelevant, they must fit YOUR feet.