Emissions from combustion depend far more strongly on the air-to-fuel ratio used in the combustion process and the way actual combustion is performed. Any dependence on the fuel species is smeared and overtaken by the combustion process.
Compared to the impact of the air excess ratio and the burner design, the effects of fuel composition on the exhaust gas composition are often of secondary importance. So it really depends on what kind of emissions you're interested in. NOx for example can be very dependent on the content of N-carrying compounds in the fuel. But even then, air excess ratio and burner/combustion chamber design in general have a huge impact on the actual NOx emission.