One of my books, The Tarot Handbook by Angeles Arrien, says that the sphinx is put on the top of the wheel to illustrate a new way of doing things.
I don't know that they share the same zodiac. I have information that the Wheel is matched with Jupiter, While the "World" or "Universe"  is Saturn's.
I know that the Wheel's Jupiter-size-like backing multiplies the position where it is put or it's cards near by. As in to the power of 10. If the Wheel is capable of meaning a great burden or illness if reversed, or like being under a rock, as if the wheel is made of stone. If up and isolated, can mean a great deal of relief and "fortune".
Though  is named Universe, I think that that is a nicety. I call it "El Fin" like at the end of an old movie. I've seen it mean death frequently, or "as big as death" like an accident or a diagnosis that was walked away from. In a relationship  can mean a finalization was made -- no crying involved. Reversed  is as whaling as a Siren, loud, emotional and needy or if you are the Siren "self expressing" needing a "fair relationship"
The Wheel will apply more to a job or one's emotional health, cheer, or toxication level. The Universe has more fate - collisions and misses and human thriumphs to it. Sometimes if the  is reversed it can actually be running water such as an aquaduct, gutter, flooded basement, or the tub over flowing. The Wheel does not share this direct connect with visible reality.