Csvデータの突き合わせ

日付と金額をキーとして突き合わせをして、日付と金額の差額を結果に表示させたいです。
どのようにすればいいか教えていただけますでしょうか?
差額はdata2.csvの値からdata1.csvの値を引いたものです.

よろしくお願いします!

↓data1.csv
image

↓data2.csv
image

↓結果こうしたいです。
image

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