One is the original drama, the other is a short epilogue giving a sweet ending and weddings for the couples.

One is the original drama, the other is some added scenes for the couple.
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One is the original drama, the other is a collection of missing scenes and a very cute epilogue to the series.

One is the original series, the other a bonus epilogue that concludes the story. While the original drama has a closed ending, the epilogue adds a bit more and has a sweet, happy ending as well.

The third season continues the story.
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The second season continues the story.
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One is the original drama and the other is a short spin-off that expands part of the story and has the same cast.

One is the original drama and the other is a special mini-series drama spin-off with the same characters. The mini drama is very cute and funny.

It's the fourth film in the series and continues the story.
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Both are special episodes for Cherry Magic.
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Both are short dramas in which a couple breaks up then reunites years later. In between, the FL has given birth to their child that the ML is unaware exists.

Both are light dramas with a modern day FL in a historical setting, and a prince ML. Both princes suffer from illness or poisoning.