Lukum,
Although I have not used this machine that you have, in general, espresso coffee is ground very fine, and is used without a filter. This results is the creamy, intense brew that is espresso. Regular coffee, on the other hand, is brewed differently, and requires a coarser grind. I definitely would not mix them up!
Hope you have fun making yourself some great tasting coffee and espresso!
Hope this helps.
Ellie