Internal hiring for UNV positions?

Do people hire internally for International UNV position? I understand that consultant positions are often opened for specific people within the team, but UNV position?

For Context: I recently applied to a WHO UNV-International Specialist position in Dhaka. The deadline for the application was Feb 25, but the starting day was March 1. I contacted someone on LinkedIn and asked him if it was an internal hiring, he said the process is "fair and competitive". However, I now see another role open at IOM Dhaka with the deadline od March 10, but the starting date of March 11.