Apple - Downgrading MacBook Pro 16” to Mojave
No. This won’t work since the drivers to run this hardware only ship with Catalina.
If your support team isn’t ready for Catalina have them get you VMware fusion so you can run the older OS virtually while they contemplate supporting the new os.
I just spent a chunk of time with Apple support; they said it's impossible to install Mojave on the 16". Sigh.
Also this: "No macOS Mojave on MacBook Pro 16" from gottabemobile.com