Not sure but I know that my aunt tried this....
she had too much starter and froze some as a liquid and then tried bringing it back out to make some bread with it and let it thaw at room temp and the bread would not rise even when she put it in an oven she couldn't get a rise out of it she said. For a while we were all over run with starter and looking for ways to not waste it.
I will ask a baking teacher but I think commercially produced yeasts are a lot hardier than natural or wild yeasts that are in these types of starters.