Identify data difference between months

Hi, Shiqi_C 

You can try the following methods.

Table:

Table 1 = CALCULATETABLE('Table','Table'[Month]="March")

Table 2 = CALCULATETABLE('Table','Table'[Month]="April")

Then join Table 1 and Table 2 with the part field.

This view shows that D1 is unique to March and F1 is unique to April.

Is this the result you expect? If not, please show the output you expect in the form of a picture.

Best Regards,

Community Support Team _Charlotte

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