If you manage Etsy and Shopify stores, you've probably seen that Etsy and Shopify manage their variation differently.
Shopify requires you to set SKUs and pricing for each variation, whereas using Etsy you can set quantity and pricing on listing level.
The gap comes out once you need to sync between the variations ? fortunately there is a simple way to overcome the issue. Here is the solution :
1.Go to Etsy listing
2.Click on "Edit Variations" button
3.Check "Quantities vary for each primary color"
4. Check "SKUs vary for each primary color"
Now you will have a table under the variation section to fill SKUs and quantities, same as Shopify.
Simple and quick solution!
Good luck :-)