Revenue and sales are the same thing for Getty aren't they?
The OP here also references 'downloads'. 75% of downloads is unlikely to necessarily represent 75% of revenue.
Sales and downloads would be the same thing - except that many buyers actually buy a large credit pack rather than an individual image. So then what is a sale exactly ? And the relationship between the prices of exclusive and non-exclusive content is further complicated by the different royalty rates.
Sales, downloads and revenue are 3 subtly different things. The percentages are unlikely to be casually interchangeable. You could say for example that exclusive content represents x% of the total content used (downloads). The money that content generates may represent a completely different %age of the total income.
So no - I don't think that % of sales and % of revenue are the same. And probably different again from % of downloads.
ETA: yet again Baldrick gets in first with a simple answer as I try to clarify what I mean !