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Protip: you want to dig the hole ahead of time. Otherwise someone might stumble upon you with a body, and then you have to dig two holes.
At that point wouldn't it be more efficient just to dig one slightly larger hole?
It would get prohibitively difficult. You need to be deep enough that scavengers and cadaver dogs can't detect the body, and natural erosion doesn't uncover it. To do that you need a 5-6 foot hole, to get 4-5 feet of dirt on the body. 2 bodies in the same hole means 7-8 feet deep, which is hard to get out of and can collapse on you.
A decomposing body will also naturally cause a depression in the ground as it decomposes, two bodies would make a more pronounced depression. You can mound the dirt to counter this, but that makes it more noticeable as well.
Alternatively you can do what I do when we find dead deer on the property. Just a shallow hole with a layer of sawdust and straw covering it that's been inoculated with lactic bacteria acid.
The lactic acid bacteria supercharges the decomposition process and prevents any smell associated with putrefaction. You basically pickle the corpse with bacteria that outperforms the natural rotifier microorganisms.
In this method you can fully decompose a 150lb deer in around 30 days without any real smell. You can also then retrieve the bones, roast them over a fire to make them brittle, and then break them down to dissolve in regular vinegar, making a liquid calcium spray for your garden.
To learn how to make your own lactic acid bacteria at home using everyday products, you can look into Korean organic farming.
If you're digging a hole to bury a body, it should already be big enough that you can just toss another body in with it.
In that case you should make sure that the person dies very close to the hole you dug. Bodies are heavy! This is one of the main reasons why it’s very difficult to perform the perfect murder.