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Many engine parts are fairly specialized and non-interchangeable unless the replacement part really is identical. However, even different model engines may use the same parts. For example, the identical connecting rod, piston, piston pin, camgear/camshaft and oil pump, valves, valve lifters, ignition components, and flywheels are used in several different 3-5 HP Tecumseh engines. Even the same crankshaft may be used in multiple models but slight variations like whether there is an auxiliary power take-off or not can complicate matters.
Carburetors, magnetos and other ignition components from similar sized engines from the same manufacturer may be substituted in many cases. I have even heard of people adapting a larger carburetor to a small engine (with varying levels of success).
Here are some of the alternatives for obtaining replacement parts: