How do I compare and combine two object array into one?

I have been stuck trying to implement this forever. do you think you could help me out merging two array objects based on the key PartitionKey and if the PartitionKey don't match up, still add it to the array anyway?

let arr1 =[
  { PartitionKey: '047', AttributionCount: 61 },
  { PartitionKey: '043', AttributionCount: 136 },
  { PartitionKey: '053', AttributionCount: 36 }
];

let arr2 = [
  { PartitionKey: '043', ReportCount: 5 },
  { PartitionKey: '047', ReportCount: 2 },
  { PartitionKey: '045', ReportCount: 2 },
  { PartitionKey: '041', ReportCount: 3 }
]

let arr3 = arr1.map((item, i) => Object.assign({}, item, arr2[i]));

console.log(arr3);

I would like to return the result of

[
  { PartitionKey: '047', ReportCount: 2, AttributionCount: 61 },
  { PartitionKey: '043', ReportCount: 5, AttributionCount: 136 },
  { PartitionKey: '053', ReportCount: 0, AttributionCount: 36 },
  { PartitionKey: '045', ReportCount: 2, AttributionCount: 0},
  { PartitionKey: '041', ReportCount: 3, AttributionCount: 0}
]

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