Most companies do not publish sales data (Evil Hat is a notable exception to this).
You can infer some limited information -- such as what 'metal award' bracket something is in on DTRPG, an Amazon ranking, or what it raised on Kickstarter -- but those aren't solid numbers and there's no way to know what they sell on their own websites or through distribution or at conventions. You also don't know what percentage of their sales are made through what channels. And for some channels you can access BookScan data. But these are all just bits of data, not the whole picture.
So the short answer is generally no, not really, unless they tell you.