Answer: If you look at all the seeds in a given seed packet for a single variety, you will see very little difference, if any, in size. However, some of those seeds will produce bigger, more robust plants. Generally a good viable seed will be plump and firm while a questionable seed might be drier and weigh less or even be only partly formed. In that sense, a larger seed will give you better chances at a better plant.
If you look at a large seed such as an acorn and compare it to the much smaller seed of a maple tree, both seeds produce rather large plants. An even larger seed than that of the maple, say a castor bean seed, may only produce a plant eight feet tall.
To answer your question, I suppose the answer is "not necessarily".
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