Hi Stefan,
Thank you for contacting Syncfusion Support.
Yes, it is possible to assign same datasource to block appointments and normal appointments and for the same we have prepared a sample for your reference which can be viewed from the below link.
<Code>
<ej-schedule id="Schedule1" width="100%" height="525px" current-date="new DateTime(2017, 6, 5)" current-view="Day">
<e-blockout-settings enable="true" datasource="@ViewBag.appointments" id="Id" subject="Subject" start-time="StartTime" end-time="EndTime" is-all-day="AllDay" is-block-appointment="BlockAppointment"></e-blockout-settings>
<e-appointment-settings datasource="@ViewBag.appointments" subject='"Subject"' start-time='"StartTime"' end-time='"EndTime"' all-day='"AllDay"' recurrence='"Recurrence"' recurrence-rule='"RecurrenceRule"'>
</e-appointment-settings>
</ej-schedule>
</Code>
Note: The appointments will render both as block and normal appointments. Therefore, we recommend to use individual datasource for block and normal appointments.
Regards,
Nevitha.