Having two objects key is same and wanted to map to a new object with same key append with _old and _new. below are the sample objects and the expected result is below. experts, please help :)

oldobj = [
    {
        AddressLine1: "ABC Old",
        AddressLine2: "DEF Old",
        AddressLine3: "GHI Old"
    }
];

newobj = [
    { 
        AddressLine1 : "ABC New",
        AddressLine2 : "DEF New",
        AddressLine3 : "GHI New"
    }
];

Below obj has new and old obj, key is same with _new & _old. Wanted to map the value that .. _new with objnew(refer the object above) and _old value with objold(refer the object above)

mixobj=[
    {
        AddressLine1_new : "string",
        AddressLine1_old : "string",
        AddressLine2_new : "string",
        AddressLine2_old : "string",
        AddressLine3_new : "string",
        AddressLine3_old : "string"
    }
]

Result to be expected is

mixobj=[
{
AddressLine1_new : "ABC New",
AddressLine1_old : "ABC Old",
AddressLine2_new : "DEF New",
AddressLine2_old : "DEF Old",
AddressLine3_new : "GHI New",
AddressLine3_old : "GHI Old"
}
]