Compare two SQL tables and return count of rows with changes

I have two partitions from an SQL table containing num_key records. I need to compare and count changes in the February records versus the January records.

SAMPLE DATA AND DESIRED RESULTS:

ptn_dt = '2019-01-31' (January)

num_key	active_indicator
111	true
112	false
113	false
114	false
115	true
116	true

Copyright Notice：Content Author:「JM DR」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/67381352/compare-two-sql-tables-and-return-count-of-rows-with-changes

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