They both say that what started as consensual sex became non-consensual
That's a gross misstatement of the facts. In one case, the woman was asleep at the time sex started. She had previously told Assange no to sex, and then went to sleep. She woke up with him inside her.
... which is rape in Swedish law.
Penetrating someone who is unconscious is rape in most countries.
Assange has not been charged with a crime as yet.
That's also grossly misleading - in Swedish law, the charging comes at the very last stage, prior to trial, which has to commence within one week of the charging. The fact that he hasn't been charged yet is simply because he's hiding out.
Frankly it looks like a case where two women discovered that they were both having sex with Assange and decided (together) to come up with a way to get back at him - there's no way to prove that sex becomes non-consenual while it is in progress. It's a classic "he said, she said" situation.
Not at all. Assange admitted during his extradition appeal to the UK High Court that he had sex with the sleeping woman, knowing that he didn't have consent. There's no "he said, she said," because everyone agrees on the facts - he penetrated her, knowing that she was unable to give consent and unable to resist. As the court said, "it is difficult to see how a person could reasonably have believed in consent if the complainant alleges a state of sleep or half-sleep."