In an ideal world of course you would, however for all practical purposes the difference in flow front and rear will not make a discernable difference, and certainly not a big enough difference to even worry about.
I disagree with this to an extent based on some R&D I did a while back and my experience between stock, stock location silicone inlets, and custom built inlets. The OP source pretty much is inline with my findings and this is the first time I am seeing those air flow results.
I agree with you that the "difference in flow front and rear will not make discernible difference" which depends on how much airflow is being demanded. What matters is how much bias there is in the airflow which can have an impact on the fueling system from what I have seen.
Here is a complete stock N54 with a custom tune with an ethanol blend. I was testing the stock intake system on my Z4. Pay attention to the fuel trims, normal.
https://datazap.me/u/buraq/dyno-stock-tune?log=0&data=3-12-14-15-19&zoom=83-242
About 7 months later I went FBO with stock location silicon inlets (with PCV support) in one day. So it was time to turn things up. Again, pay attention to the the fuel trims
https://datazap.me/u/buraq/log-1456696348?log=0&data=4-21-23-24-29&zoom=32-78
In the above log more fuel is being added (deviating from target) at peak power "only on bank 2", which has a significant impact on the HPFP. IF I "lowered" boost, fuel trims would be fine, but when I raised boost we are back at deviating bank 2 trims and fueling going rich and the HPFP spiking downward. I went through two sets on silicone inlets 2.0" and 1.75" all results the same.
Now the only way to counteract this behavior was to bias the bank 2 scalar table in the affected RPM/Load area which technically is a band aid. You want to keep your scalar table values equal matching on the banks (not advised to bias scalar tables on the N54).
I have seen this same behavior on other cars and have asked customers to clean their rear filter which seems to to get more dirty than the front and it helped improve fuel trims on that bank.
I got fed up with my fueling behaving like this, almost thought it was the injectors, but my deep hunch from looking at previous logs led me to believe it was the inlets, so I decided to get custom inlets that were not all silicone and of a different design setup. So i decided to go the Carbon Fiber route.
These inlets have no PCV support, in fact the PCV venting with a OCC connects to the intake box to recirculate. (This project is still undergoing developement)
Here is what my fuel trims look like now, pushing a hell of a lot more power than before
https://datazap.me/u/bqtuning/log-1525580155?log=2&data=3-21-23-24-29&zoom=67-127
I am now running equal and matching scalars on both banks.
I wasnt planning on bringing this forth till my project was done but might as well now to consider contrary thought on the topic to weigh in.