[{"_id":1,approvedNumberedField:23},{"_id":2,approvedNumberedField:23},{"_id":3,approvedNumberedField:1}]

db.collection.aggregate([{$project:{_id:0,name:"$_id",count:1}},{$group:{_id:"$section-1",count:{$sum:1}}},{$match:{$expr:{$eq:["$approvedNumberField","$approvedNumberedField"]}}}])