Is it 1:1? BitcoinCash : HardForked Coin?
It's more complicated than that.
If we continue on the current path, with no reconciliation before the fork date...
Bitcoin SV is enforcing one set of changes.
Bitcoin ABC is enforcing another set of changes.
Cobra Bitcoin is enforcing zero changes.
Bitcoin Unlimited allows each user to set which specific changes will be enforced.
We could end up with three, four, or even more chains going forward, depending upon who mines with which rule set. And any way you look at it, any of the forks will initially have legitimate claim to 'The Real Bitcoin Cash'. For some people's philosophy, this will mean that any of these forks will initially have legitimate claim to 'The Real Bitcoin'.
Both SV and ABC are known to have significant hash power behind them. They both seem wedded to not accepting each other's changes however. This seems destined for at least a two-way split.
Hopefully, everyone who runs Unlimited will configure it to accept at least one of the changesets implemented by SV or ABC. This would eliminate the 'four or more' scenario.
I am unaware of any significant hash power dedicated to the Cobra path. If none materializes, there will likely be no meaningful Cobra fork.
I'm still hoping for a kumbaya moment.