Ned
The EC225 has the Makila 2A1 engine rather than the 1A2 of the L2. The 225 has FADEC with dual channel and as a backup it will mirror the good engine if both channels fail which of course will never happen according to EC.
The 225 has a 5 bladed main rotor for increased speed and reduced vibration...which is true, it is fast and smooth. The L2 only has 4 blades.
The EC has the Avionic Nouvelle cockpit while the L2 has a mix of glass flight instruments and analog engine instruments. The 225 cockpit is the best available in terms of integration and presentation. Its the best available on the market today, similar to the EC155 cockpit.
The airframe is the same as the L2 although I think the 225 has slightly more fuel capacity and sponson tanks as standard fit.
HH