Probably the same content but the first one is IOD = instructor on demand (see https://www.splunk.com/pdfs/training/SplunkEDUSubscriptionsIOD_Feb2019.pdf )
IOD mean you can do it self paced over 30 days and when ever you have.a question, you can contact a instructor on demand and chat with him (not sure on what hours/days but I think there is a pool of instructors for this)
(versus a classic virtual or on site class where the class has a exact schedule and every trainee is doing it at same time)
so I would just choose the one that best fit how you want to learn.
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