Detailed differences between X-SPDIF 2 and 3

[leaves]

I am considering upgrading from X-SPDIF 2 to 3.
So I would like to know what the differences are in detail between the two and if there is any possibility of a significant improvement in sound quality.
The environment used is a high quality linear power supply, a high quality USB cable with only the signal line with the power line eliminated from the PC, and a high quality I2S cable to an X-Sabre 9038 Pro (unmarked) with a 128fs synchronous drive.

Is it worth replacing in this environment?