How to identify change in industry field using triggers?

Summary:

When we update the Industry field on accounts changed CX, how can we able to identify the changed value from scripts?

Content (please ensure you mask any confidential information):

Hello Experts,

On Accounts We are using Industry field, we sync from CX to AR setup for accounts.
We are attempting to write script when industry field is updated in CX same to be update in AR, we created Before update trigger and tried syncing the value using below script:

Before Update script is not getting trigger when we only change the industry field, when update some other field then in script is getting trigger. Is there way to write script around industry change?