My fiance works in a t-shirt printing shop and I work as a developer. I enjoy hearing about his work, he enjoys hearing about mine but we know neither of us could do what the other does.
If the occupations are so alien to each other probably you wouldn't be attracted by that person to start with. If your SO is eg. an hairdresser probably it is boring but if her occupation is something you would like to know more about, it's not. As an anecdote, my ex was making a thesis in International Relations and at the same time she was taking a Spanish Philology course. I can say to you that I learnt a LOT just by being nearby.
It gets boring even when your occupations are so alien to each other, that there's little you can share beyond bog-standard office gossip.