Can the Mavic 3E controller be used with the Mavic E? I believe they use a different app?

Hello, Waxings. Thank you for reaching out. Mavic 3 Enterprise remote controller is not compatible with the Mavic 3 and vice versa. They also use different applications, DJI Pilot 2 for Mavic 3 Enterprise while on the Mavic 3, it's DJI Fly. We hope that we have answered your questions. Thank you for your valued support.

Yeah, I can vouch for what Gamora said.  I tried this various ways, including bundling up the Pilot 2 APK (the version on the controller not the one in the download site) and it won't even run on the RC Pro.  They are similar devices, but not the same.