Meanwhile I wanted to install the scl version of nodejs8 to do some testing. Unfortunately I came across this error:
Transaction check error:
file /usr/lib/rpm/nodejs_native.req from install of rh-nodejs8-nodejs-8.11.4-1.el7.x86_64 conflicts with file from package nodejs-1:6.14.3-1.el7.x86_64
I could use --force, but I do not want to mess up the RPM db and logic.