Database
[{"_id":ObjectId("60c7180d5ef87b4de490c56d"),"data":{"user":[{"country":"Netherlands","supplierCountry":"Denmark"},{"country":"France","supplierCountry":"Denmark"}]}},{"_id":ObjectId("60c7180d5ef87b4de490c56e"),"data":{"user":[{"country":"ITALIE","originalCountry":"ITALIE"},{"country":"France","originalCountry":"France"}]}},{"_id":ObjectId("60c7180d5ef87b4de490c56f"),"data":{"user":[{"country":"UK","originalCountry":"CANADA"},{"country":"France","originalCountry":"France"}]}}]
Query
db.collection.aggregate([{$match:{$expr:{$eq:["$data.user.country","$data.user.originalCountry"]}}}])