You don't need a new GTIN
As best can be understood from the answers that you've provided to the previous questions, you are not required to change the product's GTIN because of the particular product change that you just considered.
If you have made (or are planning to make) any additional changes to this product that you have not yet evaluated using this tool, please answer the below question with "YES".
Also, please note that there are no rules that would prevent a brand owner from changing the GTIN of a product MORE often than may be required by compliance with the rules.
Lastly, please note that local, national or regional regulations may require more frequent GTIN changes. Such regulations have precedence over any guidance provided within the GS1 system of standards.
Thank you for using the GTIN Management Rules Decision Support Tool!