Cabinet boxes are always the interior color, unless upgraded to a finished side or a decorative door panel is ordered. No point in paying extra for finished sides that don't show. Sounds like you didn't understand that you would need to finish off he exposed sides. Are these the Chinese cabinets off of the website that you ordered?

Unfortunately, I've seen a lot of posts like this all across the Internet about big box stores not backing up the product. I'm sorry, but I don't have an answer for you. Maybe google complaints against HD and see what others have done? How large is the difference in color? Is it something you could live with since it is on the interior of the cabinet?

Just order the decorative door ends like the KD should have ordered. Simple.

You are saying inside?
Unless it's a glass front that will be lighted I don't see the problem.

IMO your contract is with Home Depot, not whoever made the cabinets. It's up to them to deal with it. However, getting them to deal with is will probably be a major challenge.

You know, upon reflection, I don't think any of us have a clear understanding as to what the problem actually IS here, or if it's actually a problem. You need to post pictures of the issues to illustrate what you're talking about here. Also post the cabinet box nomenclature found on the outside of the box or pick ticket, and the design that was worked up for you.

I had a very negative experience with HD with a wall to wall carpet purchase. They installed it and it was a foot too short. Their solution was to patch the extra piece in, rather than remove it and replace it. It took many phone calls which weren't returned, a huge hassle and a long, long wait for the new install once they finally agreed to replace it. I hope you have better luck.. Sometimes the money you save with the big box store isn't worth it in the long run. They did make it right eventually. You have to be persistent, keep after them or they won't make it right.

I am confused - the inside of the kitchen cabinets are often a different color from the outside

"The home depot shipped us the cabinets with cabinet boxes with the combination of two different colors. Inside of the cabinet, there are two different colors. One side panel is darker and other side panel is lighter."

The inside panels of the cabinet boxes are two different colors. We don't know what the material is, but if it's a wood product, I don't see why it matters. It's not "damaged", it's just the nature of wood.

Truffula, exactly. I think the OP may not know what normal cabinet construction involves, and that what they've received is not "damaged". But, without the pictures, and knowing where the cabinets fit in the design, it's difficult to say.

It sounds to me like the insides of the cabinets are two different colors, one inside panel is dark, the other inside panel is light.
Could you post pictures of how much difference there is? Is it a completely different wood? Is it just some color variation?
Below a link to the cabinets. They state that the cabinets "have matching interiors," i.e. matching to the wood on the outside, so it could be possible that the inside melamine pattern on one side is totally different from the other inside if they messed up during construction.

Here is a link that might be useful: HD Fabritec kitchen

Looks like the insides are wood-look melamine, so they should match.

Please post pictures. No one knows what you are talking about.