Although Shuttle doesn't directly support transfers between two Etsy shops, you can use Shopify as an intermediary to accomplish this.
Here’s how:
First, use Shuttle to transfer products from your first Etsy shop to Shopify.
Then, once the products are in Shopify, use Shuttle again to transfer them from Shopify to your second Etsy shop.
This allows you to move your listings between Etsy stores with full control over the process.