Outlook eventID in Google calendar

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C++/CLI

Google

Outlook

I am writing an Outlook add-in which sync's with Google calendar.
EventID of Outlook calendar is in binary format that I can convert
into HEX string (contains characters between 0-9/A-F).

I wanted to know whether Google calendar eventID is HEX string or not? So that I can directly store Outlook calendar eventID in Google calendar and vice-versa.
If not, then my alternative approach would be to save outlook binary eventID to Google calendar event.

So, is there any reserved field or custom field wherein this kind of eventID can be stored? I am using Google .NET client library to interact with Google calendar.

Regards,
Anshh