Regardless of the models, you can always connect a single motor to one or more models by splitting the axle using (for example) angular wheels or bevel gears.
I covered two ways of transmitting horizontal to vertical torque here using worm gears and knob wheels on a previous question about transmitting horizontal torque to vertical.
jncraton also has a good demonstration of using bevel gears to achieve the same thing, which I think would work better in this case, although it really depends what parts you have lying around or are willing to purchase.
The principles also apply here except you need to use three axles/joints instead of two. If your models are further apart you can use extra axles connected to standard Technic axle connectors or u-joints (Universal Joints) which can be used at small angles.
Your transmission might end up looking like this. The red axle provides the drive from the motor and rotates the green and blue axles for your two separate models.
You may also wish to adjust the gear ratios directly at the transmission box or on the models themselves to get the speed more realistic. You may want the Ferris Wheel to rotate slower than the carousal for example.