If cloning technology were perfect, then there'd still be no difference between killing a cloned animal and killing the original, any more than it's okay to shoot an identical twin who was born three minutes after its other twin, for identical twins are technically natural clones, but they're still equal humans.

However, currently, artificial cloning technology is not perfected. In fact, given current methods of cloning, cloned animals are not as healthy as the original, so the best anyone could make for the case is that they'd be puting the clones out of their misery, and the more obvious case is that now not only are we going to be killing an animal to eat it, we're going to make them suffer more in the meantime before doing so.

However, what makes a lot more sense is vat-production of the meats that we want from the animals.

If we've got the technolgoy to clone an animal, we've got the technology to take out just some muscle tissue, and trigger that to grow in a vat, to produce just a vat of muscle tissue, and in fact, technology like that is used to produce expensive skin-replacement for burn victums.

All we have to do is get the cost down, and the way to do that is use methods of mass production like are being abused in the mass operation of factory farms, to just "ferment" the cells of the tissues that we want to eat.

Once scaled up, it would be a lot cheeper than operating a factory farm, because you can just feed the vat basic nutrients, and it would be easier to keep sterile so you wouldn't have to worry about abuses of anibiotics, and it would be more efficient, because all the food energy of the suplements would be going to grow the food tissue instead of all those other parts of the food that the animal craps out and/or becomes body parts sent to the rendering plant.