CPQ"" is a type of application, not a file standard. Configure Price Quote. More than a few specific vendors, and I'm sure all have different file output formats. I suspect SF's outputs reasonably generically since it would go to any number of ERPs.
That said, the main appeal to CPQ is to generate the quote with proper pricing. Depending on the firm, they might have only 1 sell in 10 quotes, so integration isn't that big a deal as long as the product and pricing don't change too much.