You need to keep the font label same for all the text / textarea fields you want to have same font choice.
Single font choice for multiple fields
Related Articles
How to Trigger Klaviyo Add To Cart Event for Personalized Product
Single Color choice for multiple field
How will I keep only one input field for multiple text/image
Disable Add to Cart button until Product Options has been loaded
How to create tab by text or image
How to add multiple product views from different angles