can anyone explain to me if it is possible to fly with a than NEW EASA PPL in the whole of EASA land a N/reg airplane?
It is up to the State of Registry (the USA in this case) to decide whether a particular pilot license is acceptable to them.
The FAA has repeatedly ruled that FAR 61.3 is to be interpreted strictly on the word "issued". There are two Chief Counsel rulings on this.
That means that the present situation:
currently I can only fly with a JAR-FCL PPL an N reg airplane in that country the licence is issued.
will not change.