Sync with other iPhone Calendar apps?
 

I am looking at a replacement Calendar app (CalenGoo) for my iPhone which syncs with my Google Calendar, and looks to have better integration with GCal. My question is if my OF tasks will still appear in the new calendar like they do in the built-in iPhone calendar (syncing over WebDAV).

Is the the task due-date sync only for the native iPhone calendar, or will it also work for third-party calendar apps?

Thanks!