Solved: Wendax 557 - Burkart & Günther bodied two-seater

[Wendax]

There are two facts that make me hesitate to say that it is the same car. At first, the rear looks different to me as the Burkart & Günter car has a pointed rear end. And why on earth should a small scale Austrian cyclecar builder have let his coachwork done in a Northern German company, 900 km away from his factory? Nevertheless the two cars look awfully similar. 

[Allemano]

I also think it's not exactly the same. Look at the door hinges and the dished rear rims. Also the front leaf springs seems to be different..
Most likely a case of following the same fashion. 

[João]

What a pity! The resemblance is uncanny 

Thank you both!