Using Multiple Identical Data Sets for the Same Visuals

You can append the data

https://radacad.com/append-vs-merge-in-power-bi-and-power-query

if needed

https://radacad.com/pivot-and-unpivot-with-power-bi

Preferably convert Month into month start or end date and use date dimension that will make time intelligence easy.

To get the best of the time intelligence function. Make sure you have a date calendar and it has been marked as the date in model view. Also, join it with the date column of your fact/s. Refer :
https://radacad.com/creating-calendar-table-in-power-bi-using-dax-functions
https://www.archerpoint.com/blog/Posts/creating-date-table-power-bi
https://www.sqlbi.com/articles/creating-a-simple-date-table-in-dax/

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