If I got a peavey ValveKing combo and hooked it up to a cab

or getting the half stack and hooking it up to the cab?
assuming they're the same wattage, not much
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same wattage AND same speakers, not much

different speakers, different tone
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If you're referring to the 50w Valveking 112:

- With the stock output transformer, it can only go to a cab which is rated for 16 ohms. It's also 50 watts so you'd lose a bit of headroom compared to the head. The VK112 also lacks controls for resonance and presence, only having a resonance switch between 'tight' and 'loose'.

The 112 is cheaper to mod, however, and can be turned into a head with relative ease.
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