My plan to measure the differences is to hook up an RTA and measure the frequencies at different rev speeds (eg. idle, 2k, 3k, etc) and compare the readings pre-install and post-install. From there we would be able to effectively determine if there was a reduction/increase in amplitude across frequencies.
Unfortunately I won't be able to install the new hangers just yet as we just started a new COVID-19 lockdown here where I'm from but I will get the readings once I'm able (though I have no idea when).