No. SKU aliases currently do not allow mapping multiple SKUs from the same channel (i.e., eBay or Amazon) to 1 SKU in QuickBooks Commerce. The reason being, mapping multiple SKUs from the same channel (e.g. 3 SKUs in eBay) to 1 in QuickBooks Commerce would cause complications and inconsistencies with the API rate limits.
To omit this, we only allow mapping 1 SKU from either eBay or Amazon to 1 SKU in QuickBooks Commerce.
When you install eBay or Amazon in QuickBooks Commerce, you will automatically get 1 extra SKU field per variant(s) for each respective channel. This will allow you to address the issue of different SKU names on that channel that you cannot change.