Yes, you can, but not in that example.
Charnel Touch is a Standard Action to activate - on that turn, you'd already have spent your Standard Action casting Bestow Wounds, and therefore would be unable to activate Charnel Touch - even if you had two standard actions, the touch attack is part of activation, so normally you'd cast Bestow Wounds, touch attack, then second standard action, charnel touch, touch attack.
Touch Spells and Holding the Charge: In most cases, if you don’t discharge a touch spell on the round you cast it, you can hold the charge (postpone the discharge of the spell) indefinitely. You can make touch attacks round after round. If you cast another spell, the touch spell dissipates. Some touch spells, such as teleport and water walk, allow you to touch multiple targets as part of the spell. You can’t hold the charge of such a spell; you must touch all targets of the spell in the same round that you finish casting the spell.
pp176 PHB, via Giantitp "Touch spells and Holding the charge?? Help pls"
You can hold a Touch spell's charge, in your hand, and discharge it whenever. If you were careful, you could even walk around in daily life with a touch spell in your hand, just waiting to shock your attacker.
There's a spell, Spell Flower, from Spell Compendium, that even allows you to hold touch spells in both hands.
Note the wording of that rule, though. Casting another spell obviates the charge. That means you can't, for example, cast Shocking Grasp, hold the charge, and then run up to a guy and cast shocking grasp for DOUBLE ELECTRIC PALMS SNAKE KUNG FU STRIKE. But for Supernatural Abilities, like Charnel Touch, you're fine. You cast Bestow Wounds, hold the charge, then the next turn walk up and slap someone with charnel touch - they should suffer the effects of both effects.