With every FPGA software release there have been a few people who prefer an older version. Yes, it’s system dependent and what you like is what you like. No problem there.
Still most have discovered that as they change other components in their system, they might find a newer release of the FPGA software to sound better in the new system.
For example, some have discovered that simply toeing their speakers in a little or out a little makes an amazing difference in their software preferences.
My best advice is to treat each new software release like you would a new hardware unit and optimize your system like you would if you bought a new DAC.
But if you are happy with an older software release you don’t need to do a thing. Just enjoy it.