Propensity score matching - output variable pre-treatment

[Felix Stein]

Hi all,

I am supposed to use propensity score matching to compare a treatment and control group. However, the outcome variable in question is not after the treatment but rather already in place pre-treatment. I am not interested in whether the outcome variable changes pre- and post-treatment but rather whether treatment and control group differ with respect to the pre-treatment variable. Is PSM in that case a valide approach?

Thanks in advance,
Felix