is maybe too late to answer this but it may be of some interest anyway.
There is a big difference between FPSO and FSO units.
A FPSO receive the fluid from the well at well-head pressure (high), temperature (hot) and composition (acids, sand, water, etc.).
A FSO receive a on-spec processed export crude at low pressure and lower temperature.
The flow diagram is a single line. There must be a swivel system which is a very expensive, high-tec issue in a FPSO and much simplier on a FSO loading system were the swivel can stay on the seabed.
A FSO has a loading manifold typically in the bow connected with the midship manifold typical of tankers.
A FPSO has a swivel turret in the ship were the mooring system is also connected.
The flowlines differ also completely, being actually risers the ones connected to a FPSO and a normal, in-field sealine plus loading hose for the FSO.