For all practical purposes, they are interchangeable. To my eye the 3357 seeems to be brighter on the heavier filament. (brake/turn)
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The 3157 is a clear bulb and the 3157NA is an amber color.
3157 is the bulb type, the "K" means the bulb is filled with the inert gas Krypton.
If you are looking to use the new energy efficient light bulbs on a light dimmer you will need to buy specially made dimmable CFLs. Not all energy efficient light bulbs are compatible with dimmers so be sure to check the packaging for information.
They are known as CFL bulbs. It stands for Compact Fluorescent Lamps.
why light bulbs are fragile