Unfortunately no, one chimney per appliance.
The biggest question here is, where do you spend MOST of your time.
I wrestled with your exact same scenario. My home layout isn’t set up to heat primarily with wood unless I did two stoves. I did that at my old house, and didn’t really want to do it again.
So, here, I put a wood stove in the hardest, coldest place I have in my house, my finished (insulated) basement. It doesn’t do a damn thing to help heat the upstairs, maybe warms the floor a little? But it’s there because I can make my finished basement as warm as I want, on demand, when I’m down there watching a movie..etc.
When I’m not down there, the stove is cold.
For the rest of the house, I heat using a forced air heat pump set to 68.
So, my point is you don’t have to do both appliances as wood, there are other options
This is why I came to the forum, I need people in the same scenario because the stove stores give you a bunch of what it'. So I appreciate your help. Right now we spend the bulk of the time in the basement as the second foor isn't finished off. In the future the kids bedroom will be up there so you're right. We need to decide where we want the heat and go from there. Thanks ! ! ! I just don't see a stove even sized for 4000 ft working between the 3 separate floors and the spray foam hinderance.