How do I figure out the cause of conflicts between multiple RPM files?

Error: Transaction test error:
file /usr/lib/.build-id/4b/d1434c7f9139c9e65deb95dad4693bf522e713 from install of local-6.4.2-20220725.1.x86_64 conflicts with file from package BlueMail-1.131.12-1815.x86_64

I’m trying to install both BlueMail.rpm and local-6.4.2-linux.rpm via sudo dnf install however it doesn’t matter which is installed first. Either conflicts with the other. How can I figure out the cause of the conflict?

-Releases - Local

Fedora 36 KDE

I also had to add --no-sandbox to the Command portion inside BlueMail KDE shortcut for BlueMail to open.

Where are they to be installed from?
If both are from fedora there should be no conflict.
If one or both are from another source then potentially there are conflicts if they have the same files or dependencies, and especially if they conflict with something that is already installed.

If you are using dnf to do the install it normally will point you to the cause of the conflict with the messages it gives.

The only ways I know to get rid of the conflicts are to
a. not use both
b. contact the package maintainers and make them aware of the conflicts and ask them if they can fix it for you.
c. download the rpm without installing it, then revise the packages yourself to resolve the issue.

That makes sense how you explained it. Long are the days when software mostly came from repos.

I can do b and is there a guide for c?