Graduate Diploma of Paramedicine NN4 in Practical Year
Program Code: NN4 - https://federation.edu.au/__data/assets/pdf_file/0006/496959...
The Practical Year or PJ contains practical training at University Hospital Aachen and its teaching hospitals or in an academic teaching practice. - https://www.medizin.rwth-aachen.de/cms/Medizin/Studium/Studi...
Teaching im Praktischen Jahr (PJ)
Frau Lubahn stellte ein Konzept des Fachschaftsrates zur Optimierung des studentischen Unterrichts im Rahmen des PJ vor,
das vom Fakultätsrat zustimmend zur
Kenntnis genommen wurde - https://www.med.uni-magdeburg.de/unimagdeburg_mm/Downloads/P...
Graduate Diploma of Paramedicine - NN4 - University of Ballarat - https://www.tuugo.biz/Companies/ballarat-psychological-servi...
Enrolment Program Structure - 2021
Program Code: NN4 - https://federation.edu.au/__data/assets/pdf_file/0006/496959...

I studied medicine in USA and Austria and I can tell you that there inso direct comparison. Acting internship, aka Sub-internship or Sub-I, is more or less what Austrian call Famulatur. It is not a year-long experience but rather a few rotations (aka clerkships) that are of special interest to the student and tat are purposed on a deeper level.

The best equivalence would be to say Fourth-Year Clerkship, but then again, clerkships in the USA take place in both the 3d and 4th year.

Nevertheless, I do not think that you can go very wrong saying either Fourth-Year Acting Internship or Fourth-Year Clerkship.

See here:
https://www.urmc.rochester.edu/medicine/education/medical-st...

As for NN4, I think it denotes the Qualifikationsniveau:

https://www.dqr.de/dqr/de/der-dqr/dqr-niveaus/niveau-4/deuts...

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Note added at 1 day 22 hrs (2022-01-27 16:30:10 GMT)
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Sorry for the typos, I posted too quickly. Here it goes again:

I studied medicine in the USA and Austria and I can tell you that there is no direct comparison. Acting internship, aka Sub-internship or Sub-I, is more or less what Austrians call "Famulatur". It is not a year-long experience, but rather a few selected rotations (aka clerkships) that are of special interest to the student and that are pursued on a deeper level.

I have nothing to offer for NN4 that has not already been mentioned.

PJler is definitely not resident, as already mentioned.

PJ is the final year in German medical education before completing the program of study that ends with the final Staatsexamen. Medicine is a 6-year program of study in Germany.

There is no direct equivalent in US medical education. American medical students participate in clinical clerkships during the final two years of the 4-year MD program of study.

PJ (praktisches Jahr) is similar but it is specifically a separate year in which rotations in internal medicine, surgery and a subject of your own choosing (Wahlfach) are required.

It is like the internship that one used to do in the first year after getting an MD degree in the USA, but it is different in that it occurs before the degree has been awarded.

I like to think of it as a pregraduate internship myself. I have also seen the term sub-intern used which is trying to convey the same thing, namely that a PJler has not yet completed his basic medical degree.