below is an excerpt from a prior article on FAA/JAA training in Blades Magazine:
....Compare both and ensure that your training encompasses both sets of requirements. For one example, the solo cross-country requirements of both FAA & JAA have the need for a minimum of three takeoffs/landings at differing locations; however the overall distance is just slightly farther under JAR-FCL standards. The FAA requirement is a total of 75nm whereas the JAA requirement is over 100nm. So make certain that your cross-country flight meets the needs of both. Also, please note that many of the rotary wing requirements differ from fixed-wing requirements, so you should consult someone with specific helicopter experience. For example, the definition of “helicopter cross-country flying” under FAA guidelines is any flight in excess of 25nm whereas for fixed-wing the distance is 50nm. To further confuse the matter, JAR-FCL regards any helicopter flight leaving the local aerodrome airspace to qualify.