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This is a good augmentation but check the lumens before substituting one for the other. I was looking at these types of bulbs recently and what I found is that they put out around 300 lumens, whereas my 45w incandescents (which still aren't bright enough for me) put out about 840 each. There's a recent thread here about someone who put these in and I asked him the question of whether he was supplementing the lights or replacing them. i did not see a reply at the time.

Actually most (all?) carbureted vehicles require tuning as the seasons change. You usually need to increase the idle speed and slightly richen the air/fuel mixture since there is more air available in cold temps than in hotter temps. You will likely see a slight decrease in fuel economy. The adjustments are normal and listed as maintenance or seasonal changes in most Owner's Manuals.

Gee I saw the joke.

Your original post asked if there was a performance difference. You were answered no.

You did not ask why there was two different lenghts. That answer is manufacturer design difference. They also use different rocker arm assemblies and are not interchangable.