Array Help again - compare and return new one

I recently asked a similar question but left out some important stuff. Here goes again...

Source Array
I have an array of items that looks like the following code. There can and will be many items in here.

[
    {
        "ItemId": "12345",
	"rmaId": "777",
        "UPC": "73343324400098",
        "Name": "Time Machine",
        "Description": "A new product you will love",
        "SerialNumberRequired": true,
        "Notes": "This is a note someone just entered",
        "Condition": 2,
        "Qty": 2,
        "SerialNumber": [
            "33",
            "34"
        ]
    },

   {
// more items will be here
}

]

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Edit Array
I have a second array that looks like this. There will only be one object in this array.

[
    {
        "ItemId": "12345",
	"rmaId": "777",
        "UPC": "73343324400098",
        "Name": "Time Machine",
        "Description": "A new product you will love",
        "SerialNumberRequired": true,
        "Notes": "This is a note someone just entered",
        "Condition": 2,
        "Qty": 2,
        "SerialNumber": [
            "11112222",
            "3333344444"
        ]
    }
]

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Based on the itemId in Edit array, I need any changes that don't match the source array returned to me in an array in this format.
For instance, if I am editing itemID 12345...
So if an item in the source array has two serial numbers, and both were changed, the result would be:

Desired Return Array

[
{
   rmaId: "777",
   itemId: "12345",
   serialNumber: "11112222",
   notes: "Some Notes",
   condition: "Good"	
},
{
   rmaId: "777",
   itemId: "12345",
   serialNumber: "3333344444",
   notes: "Some Notes",
   condition: "Good"
}

]

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Some things to note:

1. rmaId, itemId, upc, name, qty cannot/will not be change.
2. some items may NOT have any serial numbers, so we need to still track notes and description
3. The return array only has those 5 properties, that is deliberate.

THANKS. I way above my paygrade on this one, lol