In MVC call partial views, scripts, json methods from one project to another project

It also is a concept of the build, more importantly. And you are right, it's meaningless during runtime, or, more exactly, it does not exist at all. The whole idea of this question makes no sense.
—SA

Please see the comments above. Unfortunately, the question makes no sense. "Call" is the aspect of runtime, where there are no projects. There is no such concept as "call a view" or "call a file". You can call method (function/procedure/subroutine), operator, property; a method of one assembly can call a method of another assembly... Another thing to understand is the stateless nature of HTTP, different roles of server and client sides, life cycle... Two different pages cannot communicate directly via a "call"...
—SA

There is no real way of sharing these things. You could share Controllers etc but it would mean one project having references to (ergo all the code from) the other project so both projects would be in both websites, but only one project would be the active site.

If you google for sharing views etc between projects you'll probably find some hacky solutions, but it sounds like an anti-pattern; rather than looking at how you can do this you should be trying to find a more elegant solution to the problem that has made you want to do this.