(Part 73 in my question to find a boot...)
Could these be worn as casual boots that could also be dressed up?
To your question, I'd think they could only go so far in a dress up scenario. They are certainly not dress shoes. If it were me, I'd wear them in situations where the level of formality is somewhere between dressy, and smart casual. For instance, should the wife and I go to a nice dinner where the occasion could warrant wearing a casual suit (think POW) or a sport coat, because it's the considerate thing to do, I'd consider wearing those boots. If the occasion was prescribed formal to whatever extent, I'd wear dedicated dress shoes. Fortunately I don't have to make that decision very often.
The rules are easy to follow, it's deciding when we can stray from them that gets difficult.
Either way, those look pretty nice, and I think you'd get good service out of them.