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I don't see why not. Many (most) dried legumes are pretty interchangeable especially in a preparation like this which is essentially Arab beans-and-rice.
Red lentils fall apart pretty quickly, FYI.
I have made this before using red lentils. It definitely changes the consistency a bit... red lentils tend to get mushier, while other lentils hold their shape and texture a lot better. It still tasted great!! I say go for it, and use the recommended lentils next time.
Thanks. I don't feel like going to the store. I'll cook them less.
Chris is a trusted source on General Cooking
Even if you cook them less, they won't hold a shape. Personally, I wouldn't do it, as distinct rice and lentil shapes seem important to me in that (delicious) dish. But maybe I'm wrong. If you go ahead with it, please let us know your results.