Let's compare behavior of  a pipeline job and a freestyle job when they are triggered as parametrized build in the Post-Build section from a Mutli-configuration job.

In my example I have a multi-configuration job :

test-parametrizedPlugin-multi-conf-job that calls 2 jobs one freestyle and one pipeline :

• test-parametrizedPlugin-called-pipeline-job
• test-parametrizedPlugin-called-freestyle-job

First test, the 2 jobs are in the same Projects to build list( Note that the Trigger build from child project option is not set ):

Then the 2 jobs are triggered for each child as we can see as it is reported in the console logs of the 2 called jobs.

Second test, the 2 jobs are in separate Projects to build list( Note that the Trigger build from child project option is not set ) :

Then the 2 jobs are triggered but not with the same behavior,

freestyle job is run as expected :

but pipeline job is run for each child as we can see as it is reported in the console log: