Explain SPL and Part FCL.
If you already have a full FAA ticket you'll have to take a checkride, but no written. I assume you have something like single-engine land or rotorcraft helicopter. Generally your flight experience counts, but you'll need some prep work, both practically and legally.
If your license is based on your German permits, then it may be just a paperwork exercise - but again I'm not sure what the terms above mean.