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Sorry! The quickest 1600s can beat the slowest 2000s. Currently there is an invitation class for FF2000 as well which are between the two F3 classes as far as lap times go. There's always some overlap of the classes due to driver ability, set-up etc.
Both F3 classes run with air restrictors, so both are limited to about 6250rpm. Currently all the 2 litre cars use Toyota engines which are more expensive than the Lotus ones to re-build - mainly I guess because parts are so much rarer. Other 'period' engines are allowed though, such as Alfa or Ford.
The 2 litres are 10-15mph faster top speed, and quicker through the fast corners (more downforce). The 1600s are probably better balanced, and can be a bit quicker through slow corners, or in the wet.
I suppose the best answer to your original question, is that a top 1600cc car should beat half the 2 litre field.
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