If you're not signed in, the connection may not be explicit. But with a minimal amount of effort, they could easily connect the two. If you've ever used your phone on your home's WiFi, at a minimum they'll have a high degree of correlation via the IPs.

I'm of the opinion that if they can extrapolate your age, ethnicity, gender, location, health, and "interests", then they can easily join two "disconnected" profiles.