16 Mar, 2023 | Magento development
No, it is unlikely that custom themes and extensions will be compatible with Magento 2 without any changes to the code. The architecture and functionality of Magento 2 is different from Magento 1.9.1, so some adjustments may be necessary.
It is possible to migrate custom themes and extensions gradually, but it is important to keep track of any changes made during the migration process to ensure that there are no compatibility issues. It may also be helpful to work with a developer to ensure a smooth transition.
Suppose you encounter compatibility issues when migrating custom-developed extensions to Magento 2. In that case, you may need to review the code of the existing extension and make necessary changes to ensure compatibility with Magento 2. It may also be helpful to work with a developer or agency that specializes in Magento 2 migrations for guidance and support.