I'm not sure Exakta ivolved into anything, rather produced side by side with Praktica, clearly at same plant, with minor differences to differentiate.
By then 1969/70Pentacon was absorbing Ihagee or already had finalized that. The Exakta RTL 100 thus should be seen as Pentacon camera already, the model by which Pentacon cancelled the Exakta line. As it was based on the L-type Praktica series it most likely was already made at the Praktica production line.