I can’t tell much about your process from the pictures. Here are the procedures for projecting detail. Select the method best for your situation.
Here is a video showing the the process.
Be sure they both occupy the same worldspace. Make sure to subdivide the mesh sufficiently to hold any incoming detail. Sometimes the “Dist” slider in the Tool > Subtool > Projection menu needs to be adjusted, or even maxed out to capture all the detail.
If you still can’t get it to work, we will need to learn more about your process to determine where it might be going wrong. Please illustrate this as best as possible, with screenshots of the Zbrush interface if possible.