For comparison reasons, we add two channels - Diffuseand and Lighting render elements.
A deep .exr file will only contain the render elements that have their Deep output option enabled. It will not contain any other render elements. In this case, the deep exr will contain only the Diffuse channel.
The standard multichannel .exr file will contain all of your render channels, regardless of their Deep output information.
Column
width
5%
Column
width
33%
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The Diffuse Render Element has its Deep output option on.
The Lighting Render element has its Deep output option off.