At the time, there were several companies that made treadles, so sometimes you'll see the same irons used with different tops for different machines.
Some of the bigger companies (like Singer) made their own cabinets and treadles.
So don't worry about the irons, look at the opening, hinge spacing and hinge type.
I've taken a Singer parlor cabinet and modified it so I could set other machines in it. The opening in the table is standard, and I have bases for the machines and the machine sits on the base in a way so the belt will line up correctly. Some machines the belt to the inside of the flywheel, and some to the outside and that makes a big different in where the machine needs to sit.