Hello,

If you can't gather the data of the outcomes, that's ok - I'd suggest to put a learning points from your perspective (what you've learned)

If you mean the number of paying clients that pay the product / service of your startup, sure, that can be the outcome.

Not sure about your second question.

I'm not sure what do you mean by comparable. If you can help clarify and re-articulate the 2nd question, I'd be happy to respond.