"雪中送炭"与“锦上添花”的关联性
In a Chinese dictionary, it is said two idioms, "雪中送炭" and “锦上添花”, are related. Would you explain, if you think so?

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"雪中送炭"与“锦上添花”
雪中送炭 means help you in time
锦上添花 means good already， and become better

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“雪中送炭”and"锦上添花"both mean： make sb./sth. to be better by giving help or something useful.
the difference is that the receiver in "雪中送炭" are very helpless, poor, even can't live without the help.
the receiver in "锦上添花" , they have done something good, but they would become better after getting other's help or advice.
For example: 小明收到好心人的捐赠，可以支付他爸爸的医药费了，这真是雪中送炭啊。
他本来就擅长医术，又学习了心理学，这真是锦上添花啊。

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@mayi Thanks for your helpful answer.

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hope my explanation helps