I would greatly appreciate your advice regarding using psmatch2 for matching treatment from two different years. Using a Nearest Neighbour PSM approach without replacement, I would like to match treatment observations across the two time periods (2010 and 2014) and create a "pseudo panel" of treatment. I pooled cross-sectional data for 2010 & 2014 and keep only treatment ==1.

My question is whether I should include time variation here or not. I used the following code but I am not sure if it is correct or not

Code:
 psmatch2 year14  $xlist, outcome(CHE10) common logit ate noreplacement
Or I should use the following code:
Code:
 psmatch2 treatment year14  $xlist, outcome(CHE10) common logit ate noreplacement
Thanks in advance for your advice