Import Rise 360 content from different account

From your Rise dashboard, you can send a copy of any Rise course to anyone else with an Articulate 360 license.

Here's more info:  https://articulate.com/support/article/Rise-How-to-Send-a-Copy-of-a-Course-to-Another-Author

If both companies have Articulate Team Accounts, team members can actually share/collaborate on the same Rise source files. Here's more info about that: Collaborative Authoring in Rise 360 - E-Learning Heroes (articulate.com)