The damage truly depends on the type of ammunition used (as well as caliber). FMJ (Full Metal Jacket) ammunition, what seems to be described in the article you referenced, is a non-expanding type of ammunition, typically causing less destruction than expanding types such as HP (Hallow Point), which flatten and expand on impact.

Muzzle velocities from a rifle are significantly higher than handguns, which does translate into more kinetic energy. The additional energies in a rifle cartridge will cause more shock damage to organs, as described in the article, however.

HP ammunition (not commonly used in rifles) is designed to be devastatingly lethal - specifically designed to leave very large wounds in the target, which have little hope of closing/repairing the wound.