You might be right, but it seems pretty unlikely that there are two different Finnish 1949 motor conversions of the Grunau Baby out there. The J2mcl site lists the name Carl Stunde under designer and nothing under builder, but I suspect that there is some confusion between the builders and designers. Here is a site with more pics -
http://www.iwaru.fi/galleries/OH-PXA/ - and a .pdf of the contemporary
Flight magazine article, though it mentions no names. Do we have any Finnish members who might be able to shed some light on this?