http://www.teli.us/EN_BSTermination04.pdf
https://www.eetimes.com/updating-the-bob-smith-termination-technique/
Bob Smith termination, instead use:

As stated above, the common-mode characteristic impedance of CAT6
cable will be higher than for CAT5 and CAT5e cable. The proper
common-mode termination for CAT6 cable will be about 66 ohms versus
the 52.3 ohms for CAT5 cable. If it is envisioned that there will be a
mixture of CAT5 and CAT6 in a predominance of installations, then a
compromise value between the two would probably be appropriate.

/Net/https/www.nwengineeringllc.com/files/BohnertEthernet.pdf
no difference