Freezing Yeast: Propylene Glycol Instead of Glycerol

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Die Schwarzbier Polizei
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Last time I was freezing some yeast for long storage I accidentally added to the vial 15% of Propyleneglycol instead of the required 15% of Glycerol. The yeast has been frozen for a couple of weeks already. It's only now that I have realised my mistake.

What do you think, are Propyleneglycol and Glycerol interchangeable for yeast freezing or did I screw my yeast and have to dump it and make a new, Glycerol-frozen vial?
 
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