I have a process builder with version8 in sandbox and want to deploy to prod which already having its version1.I have a doubt that will it deploy or not because another team deploy from sandbox to prod.
If you deploy it to your prod using Ant tool, do not specify the version at the end of the process builder name in your package.xml. For example:
<types> <members>My_Process_Builder_Name</members> <name>Flow</name> </types>
It will be deployed as version 2 on your prod org.
More details in the Flow Metadata API (v44) doc