DLP 9.3 and older is the legacy product line. DLP 9.4 and newer is the new product line.
The old and new product line can be installed in EPO at the same time, but only one version of each.
If you install DLP 10, that will upgrade the DLP 9.4 components from 9.4 to 10.0; but will not touch the DLP 9.3 components.
Thanks Nicholas -