Takes 2,
It depends on the situation. Those aren’t different denominations (i.e. Chasidus does not view Litvishness as apikorsus) and nowadays few congregations are specifically one over the other. However, if a chasidish Rav takes a shteller in KAJ or in Brisk, then he is not a Chasidish Rav anymore, he is a Yekkie or Litvish Rav who happens to personally be Chasidish.