Aha, I'll try to help!
The first two 42381 & 42404 are germany specials. (So only available on german schleich site)
These sets consist of earlier released articles in different combinations.
Unfortunately I can't copy the pictures from the Schleich site so here are the links:
This is 42381
[You must be registered and logged in to see this link.]which contains the new vet-van (42370) and the iceys from set 42363
[You must be registered and logged in to see this link.]So just existing sets altered together.
This is 42404
[You must be registered and logged in to see this link.]Which is the normal Hannover mare 13817 with the wash place (same as you have 42104) and a stable.
Again existing articles combinded for the sake to be able to call it special.
And this is 42389
[You must be registered and logged in to see this link.]It is this years release (or last) in the same colours as the new pink stable.
Which is almost the same as the arena 42189 only with pink roof and people and horses added. One of this horses is from rodeo set 41416, the others are regular releases.
Hope it helps!
If you have further questions feel free to ask! I don't mind, love to talk about it anyway xD
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