Mine MMR LE is number 543, manufactured Nov 05 2015.
Both photos were taken with the same settings.
Camera Sony A7, Manual, ISO 400, 1/60 sec exposure, f 5.0
Before diffuser installed.
MMR_LE-Before_Diff.jpg
After diffuser
MMR_LE-After_Diff.jpg
To be honest, it probably didn't need it on mine, the inserts were pretty good, but wanted to see how it looked with the diffuser.
Interestingly the insert for "The Duke of Burbon" seems a lot more yellow than the rest.
I've double checked this on the pinball itself and they all look the same.