Not appreciably and it's contibution to the TA can be ignored. As far as the CYA contribution to TA is is small enough at normal CYA levels of 30-50 ppm that it can be ignored also. Itis only when the CYA levels are high does the CYA adjustment become more important and is only really an issue when using an acidic stabilized chlorine source like trichor, which requires a much higher TA for ph stability. If you are using unstabilized chlorine it is a non issue. The borax buffer works differently than the bicarbonate buffer. Instead of causing the pH to rise toward 8.2 it causes the pH to fall so the two in conjucntion have an effect of helping stabilize the pH for a longer period of time.