After 92 they added the Schleich marking and the CE on the carts.
These always has the thicker base of the plug for the wheels. But instead they changed the plug before the polkadot-boxes. They made it thicker and different, see pic.
The ones to the left looks exactly the same but with blocked parts on darkbrown.
The cart to the right has a bigger different plug.
And then you have the China-made cart that belonged tothe French magazine. The polkadot boxes for this playset was not made in China.
So if yu count the chinese one also I have 8 different carts on these pictures. And I don´t mean colourshades, I mean markings and "bigger" moldchanges.