What happens after you import your products from WooCommerce and later decide to change the SKU in WooCommerce?

As SKU is our identifier of a unique product for Woo & EMERGE, if you change the SKU in Woo and try to import again, it will create another product in EMERGE. If you have updated a variant SKU instead of parent SKU, nothing will happen. Hence, you should not update your SKU in Woo for any situation.