$bean->stored_fetched_row_c, logic hooks and relate fields

Im trying to detect a change in a relationship through a logic hook but I cant seem to get the old value to compare it to the new.

I have a serial number module which has a relationship to accounts

Accounts -> one-to-many -> S_SerialNumber

this is visible in my module view and i can get the relationship data if i query the S_SerialNumber

    "accounts_s_serialnumber_1_name": "ID Print",
    "accounts_s_serialnumber_1": {
        "name": "ID Print",
        "id": "cac71e64-7c2c-11eb-9bf6-066c2def7d44",
        "_acl": {
            "fields": {
                "business_center_name": {
                    "create": "no",
                    "write": "no",
                    "license": "no"
                },
                "business_center_id": {
                    "create": "no",
                    "write": "no",
                    "license": "no"
                }
            },
            "_hash": "e376f7492abb281a71d6a0860441877a"
        }
    },
    "accounts_s_serialnumber_1accounts_ida": "cac71e64-7c2c-11eb-9bf6-066c2def7d44",

the problem I'm having is I want to detect if this relationship is changed on an after_save logic hook

My before_save hook captures the data with the 

        public function get_record($bean, $event, $arguments)
        {
            $bean->stored_fetched_row_c = $bean->fetched_row;
        }

However $bean->fetched_row does not include the relationship data for me to then compare

If I use the $bean->load_relationship() it only gets the updated data

Anybody know how you compare a relationship between a before and after save logic hook?

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