The actual CFA L1 exam scores are not released, so there wouldn’t be an actual answer to your second question.
I found the official CFAI mock exam the closest representation to the actual exam. I’d say I found the mock harder, but I was less prepared both in terms of knowledge and format at the time so it’s hard to say for sure.
I thought the Mock was way harder than the actual exam. I remember them asking some obscure questions that were only briefly mentioned in the readings, so it made me feel stupid and unprepared. The real exam I thought the questions were better written and mroe straight forward.
When I took my Level-1, I found Mock was tough and in Level-2 the other way round 🙂 Since you dont have scores you cant compare, but you can compare grades. Ideal way I feel to do is, do around 6 papers+mock, take an average, compare with your exam results. it should do.