The parallel resistors are over a hundred times higher value than the 2k2, so even using 1% resistors the end result is likely not changed more than the possible difference between any two 1% resistors.
It's nothing to worry about, with those proportions.
If you were manually matching resistors to try for perfect balance, you could add another high value one across the upper 2k2 to get an exact value, but I doubt you would be able to detect any difference in performance.
The end result is also dependant on the input balance and common mode rejection of whatever the mic is connected to.
That may be ultra-precise or very crude, from one device to another.