Yes
Each ad unit has its own code that must be used to work properly. Using the same ad code for multiple ads will result in a loss of earnings.
For example, assume that a publisher has 3 spots for 300x250 ads:
Q: Should this publisher use the same ad code for all 3 spots (create one 300x250 ad tag and use it 3 times) or create 3 different tags (one for each ad spot)?
A: Create 3 different ad tags (one for each ad spot), since re-using the same Sulvo ad code will break the ads.
What's next?
Please visit the Inventory page to create new ad tags. Once the ad tag is created, please follow the steps to publish the ad tag on your website.