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The 3157 is a clear bulb and the 3157NA is an amber color.
Essentially temperature rating. The K stands for "long life", the X for "high temperature". 3157KX is used especially in some Malibu front turn signals which double as daytime running lights. This means they run hot (in a small enclosure). For other applications the KX and LL can be used interchangeably, but in the above the KX lasts a lot longer than LL.
For all practical purposes, they are interchangeable. To my eye the 3357 seeems to be brighter on the heavier filament. (brake/turn)
The difference between the two bulbs is that energy saving bulbs have murcuary in them which lowers the amount of electricity they require and consume.
Loose bulbs will yield better plants.
2357 - 1157 = 1200
The 0 and the 3 obviously.
Halogen light bulbs are what has been around for a very long time. Incandescent bulbs are new and are more energy efficient.
Fluorescent bulbs generate light by using an ionized gas and electrical discharge, whereas regular light bulbs generate light by using heat within the filament contained in the bulb.
As a starter, the foot prints between the 2 types is different. They are keyed so that bulbs with dash 1 and dash 3 can't be interchanged. The dash 3 is for higher watt bulbs such as 26 w.
Not much difference between the headlight assemblies.The procedures for changing front bulbs is the same.See "Related Questions" below for more
The voltage source that is applied to them is the difference between AC and DC light bulbs.