Usually, when I got involved with two chicks at once, neither would take any responsibility for anything bad that happened -
they always blamed the other one, and it was an uphill battle on ice to straighten out what happened and who was to blame.
Point is, NO, do not run them at the same time.
In fact, run one treatment for the duration of the oil change - how long is that, exactly? -
then change the oil and filter ONLY, and run that for the duration of the oil change,
THEN
run the other treatment, just to be sure that the 2nd treatment doesn't get any of the first treatment's stank on it.