You mean the spacing between the screws for the switch on the left is 1 3/4" from the screws for the switch on the right? Yes, that’s pretty standard. If you have a standard 2-gang box, then you should be able to use two smart switches. You’ll need to have sufficient depth and hopefully not a rat’s nest of wires there. If the existing 2-gang box is too small, you should be able to replace with an “old work” box that’s deeper.
How about taking the switch plate off and taking another picture? Maybe I’m not understanding what you believe the limitation might be. Usually, the question is … do I have a neutral?