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Difference between GL_TEXTURE_MAX_LEVEL and GL_TEXTURE_MAX_LOD

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I'm wondering what is the actual difference between these two code snippets:

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, LODBias);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, (mipmapsNum == 0 ? 1000 : mipmapsNum - 1));

and

glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, LODBias);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, (mipmapsNum == 0 ? 1000 : mipmapsNum - 1));

Visually, they both do the same. If there are two distinc constans for one purpose, what is the difference then?

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