What I could add quite probably is, what Maveric already knows !
Both are said to be replicas with about 80% the size of the originals,
the Ju 87 has czech M337 engine, the La 9 is built on the basis of a
Yak 50, quite mildly modified, I think. (For comparison a photo of an
unmodified Yak 50 from
http://de.wikipedia.org/wiki/Bild:Yakovlev_Yak-50.jpg ).
But I don't want to degrade those aircraft, it's great work and in the air
they are probably hard to tell from the originals !