Hi John,
There is no Track Changes feature like the one in Word in PowerPoint. Since there is no event fire when do changes in text, so there is no way to record this steps. I suggest you try to compare the two documents. You could refer the link
below for more information.
# Track changes in your presentation
https://support.office.com/en-us/article/Track-changes-in-your-presentation-35dad781-50f7-4c4f-9b15-cf418f03c279?ui=en-US&rs=en-US&ad=US
Best Regards,
Edward
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