What event ID gets stored in a google calendar event when the event is created with the google calendar API?

Question

I am writing a VBA script in Outlook that will add a calendar event to a google calendar each time the event is added to the Outlook calendar. I have this functionality working and this is the code I am using (in the code below, xxxxxxxxxxxxxxx is my google email which is associated with my google calendar and the variable accessToken is a valid token I generate in the OAuth 2.0 Playground while developing):

    ' build the json string which will be sent to the google API
    
        Dim d As New Scripting.Dictionary

        d.Add "kind", "calendar#event"
        d.Add "summary", "Event Title/Summary"
        d.Add "location", Item.Location
        d.Add "id", LCase(Item.EntryID)
        d.Add "description", Item.Subject

        Dim d2(4) As New Scripting.Dictionary

        d2(0).Add "dateTime", Item.Start
        d.Add "start", d2(0)
        d2(1).Add "dateTime", Item.End
        d.Add "end", d2(1)
        
        
        Dim Json As String
        Json = JsonConverter.ConvertToJson(d, Whitespace:=" ")
    MsgBox (LCase(Item.EntryID))
    ' send the json string via POST
    Set httpCall = CreateObject("MSXML2.ServerXMLHTTP")
    Dim sURL As String
    sURL = "https://www.googleapis.com/calendar/v3/calendars/xxxxxxxxxxxxxxx/events?sendNotifications=false&fields=etag%2ChtmlLink%2Cid&pp=1&access_token=" + accessToken
    httpCall.Open "POST", sURL, False
    httpCall.setRequestHeader "Content-Type", "application/json;charset=UTF-8"
    httpCall.Send Json
    Dim sReturn As String
    sReturn = httpCall.responseText
    MsgBox (sReturn)

After I add an event to my Outlook calendar, the above code runs. The result of the first MsgBox looks like this:

This is the value of the event ID in Outlook. I pass this along to google in the hopes that google creates the event in my google calendar with the same event ID.

When google returns, this is the response text that is sent back:

As you can see, google returned a structure with 3 fields, etag, id, and htmlLink. The value in id is the same value I sent so I assumed that would be the event ID on the google calendar.

My next step was to delete the event in Outlook and have the event deleted in the google calendar by using the API. This is the code that I use to issue the delete request:

Set httpCall = CreateObject("MSXML2.ServerXMLHTTP")
Dim sURL As String
MsgBox (LCase(Item.EntryID))
sURL = "https://www.googleapis.com/calendar/v3/calendars/xxxxxxxxxxxxxxx/events/" + LCase(Item.EntryID) + "?access_token=" + access token
httpCall.Open "DELETE", sURL, False
httpCall.setRequestHeader "Content-Type", "application/json;charset=UTF-8"
httpCall.Send
Dim sReturn As String
sReturn = httpCall.responseText
MsgBox (sReturn)

The first message box displays the event ID in Outlook which matches the first image I provided. However, when this code runs, this is what google returns:

Am I correct in concluding that the google event ID is not the event ID I sent? Is the google event ID the eid variable that was returned as part of the htmllink? And if that is the case, then I assume I would need to store that eid value in the Outlook event somewhere and pass that to google on a delete request.

Any clarification would be greatly appreciated.