You probably want to change the time to display in seconds or milliseconds rather than ticks. Ticks are measurements of time specific to the CPU as far as I know. If you go to "Milliseconds" on the "View" menu, the methods grid is shown as milliseconds and then you can export these results.
When you export, you are probably getting all methods in the file and not the "filtered" display you see on screen. By default you only see methods from your own source code. You can change the filter to "all methods" and the grid should match the CSV.
Wallclock is real time and CPU time is the amount of time the function actually spent running code and not waiting for IO or thread synchronization to complete.