JS - function that gets 2 arrays and return 4 - matches & unmatches from each & and assign property when there is a match

Question

I made a demo for explaning the question -

Empty arrays -

let firstArrayMatches = [];
let firstArrayUnmatches = [];

let secondArrayMatches = [];
let secondArrayUnmatches = [];

The first array -

const firstArray = [
  {
    name: 'daniel',
    age: 30
  },
  {
    name: 'tamir',
    age: 30
  }
]

The second array -

const secondArray = [
  {
    name: 'daniel',
    age: 30,
    size: 'm'
  },
  {
    name: 'ariel',
    age: 28,
    size: 'm'
  }
]

Mapping the secondArray return key -

const secondArrayIndexes = secondArray.map(({ name, age }) => name + '/' + age);

loop through the firstArray, If match push the object into firstArrayMatches & push ...secondArray.splice(match, 1) into secondArrayMatches, else push object into firstArrayUnmatches, And assing the second array into secondArrayUnmatches.

for (const o of firstArray) {
  const match = secondArrayIndexes.indexOf(o.name + '/' + o.age);

  if (match >= 0) {
    firstArrayMatches.push(o);
    secondArrayMatches.push(...secondArray.splice(match, 1));
  } else {
    firstArrayUnmatches.push(o);
  }
}
secondArrayUnmatches = secondArray;

This is what I'm getting right now on log -

first match: [{"name":"daniel","age":30}]

first unmatch: [{"name":"tamir","age":30}]

second match: [{"name":"daniel","age":30,"size":"m"}]

second unmatch: [{"name":"ariel","age":28,"size":"m"}]

Wanted output -

first match: [{"name":"daniel","age":30,"size":"m"}]

first unmatch: [{"name":"tamir","age":30}]

second match: [{"name":"daniel","age":30,"size":"m"}]

second unmatch: [{"name":"ariel","age":28,"size":"m"}]

I got another question - I'm not sure right now if when there is a match the secondArrayMatches will get the match if his place on the array isn't the same as the match

And I can't figure out how to assing a property when there is a match.

Would love to hear about another method to do what I want to. Thanks in advance for any help