Yeap, you'll just need a Find Record action and an Update Record action to update the found record

This automation also creates a record if it can't find a record in the main table, so you can get rid of that if you want!
Link to base
There's a high probability that you'll be better served linking the records together and using lookup fields, and here's Airtable's guide on how to set up an automation to find and link records: https://support.airtable.com/docs/linking-existing-records-using-automations