MBJ;
Eurocopter differentiate between them, wrongly, in my view. Perhaps a language thing?
LAND IMMEDIATELY
The urgency of landing is paramount. Primary consideration is to assure survival of the occupants. Landing in water, trees or other unsafe areas should be considered only as a last resort.
LAND AS SOON AS POSSIBLE
Land without delay at the nearest adequate site (i.e. open field) at which a safe approach and landing can be made.
LAND AS SOON AS PRACTICABLE
The landing site and duration of flight are at the discretion of the pilot. Extended flight beyond the nearest approved landing area where appropriate assistance can be ex- pected is not recommended.
From an EC FLM.