Electrical question: Two ceiling fans, one circuit?

[Uncle Wig]

GGD wrote:
Maybe post a picture of the wires from the missing fan.

Good idea. Next time I'll take photos before I disconnect any wires, duh. Here are a couple crappy photos. So it looks like there are three white, one black, and ground for the missing fan.

This one shows the wires from the missing fan:


And this is a photo showing the wires to the fan I put up today (it's a crop from a much bigger photo). One white, one black, and ground.