Identical Product, different channel

Identical Product, different channel

In eBay I sell the same exact product in different (in stock) and (backorder) buyout listings as well as on Etsy. How are they supposed to be stored in zoho Inventory? Do they all need to have different sku's? The product only shows up in 1 item group and not the others.

Ebay listing 1: Product x
Ebay Listing 2: Product x
Etsy Listing 1: Product x