I can only speak for the Swedish context, which I know about from first hand experience working with antifascist NGOs. I do not know how representative the picture will be for other places, but it may be a good starting point for comparison with German circumstances, which would be interesting to hear more about.

One of the most important actors in the original Swedish nazi movement were SSS, Svensk Socialistisk Samling (roughly Swedish Socialist Assembly), party functionaries of which after disbanding were instrumental in building up new organisations. One of these were the NRP, Nordiska Rikspartiet (Nordic Reich Party), which was formed in 1956 and led by young student Göran Assar Oredsson. Oredsson eventually married Vera Schimanski, creating the infamous "Oredsson couple". Vera Oredsson was a German national, a young but active and committed nazi who had fled the country following the Allied victory (she was briefly married to Sven Olov Lindholm, leader of the SSS party). She and her husband Göran Assar provided the continuity link for Swedish nazis throughout the skinhead era of organised nazism.

The NRP are, among other things, infamous for their attempted attack on a public meeting of the Vänsterpartiet Kommunisterna (The Left Party, Communists) in the city of Växjö in 1985. The attempt was unsuccessful: the skinheads from the NRP present were beaten and chased off, and the tumult resulted in some of the most iconic news reporting and photography in Swedish history: https://www.youtube.com/watch?v=HEOTp0C8LmU

The NRP of the Oredsson couple became more and more marginalised over the years, as during the 1990s and 2000s they were supplanted by organisations influenced by means of Internet by the identitarianism of the newer German generation Rechtsextremen or other Hitlerites with fresh organisational approaches (i.e. the NSF (Nationalsocialistisk Front) and the SMR (Swedish Resistance Movement)).

Vera Oredsson, original German nazi, and her husband were certainly up until the 1990s capable of resonating with and organising the neo-nazi or nazi skinhead community into their party context, but lost traction around the turn of the century. Newer neo-nazi book- and pamphlet publishers have continued to print the memoirs of Vera Oredsson, she is a welcome speaker at neo-nazi events and she, at 90 years of age, continues to serve as something like a mascot for the current movement. Last year, she was criminally charged with breaching the ban on inciting race hatred when she attended a neo-nazi demonstration and performed what was interpreted as a nazi salute.