Julie here from Shopify Support.
Each time you create a new product in Shopify, a unique product ID is associated with that particular product. When it comes to inventory tracking, inventory is tracked based on this product's unique ID, rather than the product's SKU or name. To see this yourself, simply head on over to any product in your Shopify Admin. Once there, take a look at your browser's URL bar. You should see a URL similar to this:
This is also goes for variants, as each one has a unique variant ID. Because each product and variant is entirely unique, Shopify tracks inventory based on the ID, rather than the SKU or name. SKUs are often used internally to track your inventory and report on your sales. For example, you can use the Sales by product variant SKU report to help analyze your sales. However, when it comes to Shopify tracking your inventory, this is something done automatically based on the product ID and there's no need to worry about duplicate product titles or SKUs affecting this.
I hope this clears things up! Let me know if you have any further questions.
Julie | Social Care @ Shopify
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