Send empty vertex buffer data but keep Vertex Shader Input Structure?

Question

lets say i have the following structure defined in a header (for reusage):

struct VertexShaderInput
{
    float3 Position: POSITION;
    float3 Normal: NORMAL;
    float2 UV: TEXCOORD;
    float4 Color: COLOR;
};

however, some meshes dont have normals or colors and some passes (such as Depth PrePass) doesn't need Normal or Color.

Is there a way to keep the struct definition above in my shaders and simply sending "zero" bytes for Normals and Colors?