Different Process Builds, what is an X?

X is a project built in StudioX. StudioX is a version of UiPath studio built for business users, so the vb.net underbelly of Studio is obfuscated with activities that require little to no developer knowledge. StudioX and Studio packages can be published and run in Orchestrator. It’s just a difference in how the project was written.

For more, see the topic here: What is the difference between UIPath Studio and UIPath Studio X?