It depends. I own the older desert buildings and they work fine for 1/72. I also own the dirt roads, cobblestones and railtrack and they work so well that I have ordered more. I like it when my buildings are to scale. I do not own any of the newer buildings. If I look at the new Factory building for instance, I can see a BMP-1 doesn't even reach to the top of the door. Sure, a 1/72 soldier might bang his head (or not), but visually it should work I think.
In the end it's mostly personal taste though. Take a 1/72 model to the shop and ask if you can put it next to one of the buildings. If it works for you, then why not?
Edit: Just checked a review and the factory is 4cm per floor. Which is exactly the same as I used when I made my Middle Eastern houses for 20mm.