Remove Condition First vs. Second Level? gPPI

Hello Everyone,

for a gPPI analysis, I need to remove a condition (Condition C) since it is only "task control" and not really relevant to the main research question. In a corresponding SPM task-analysis, this condition was subtracted at the first level.

If I two groups and these six conditions are set up at the second-level in CONN:

Group1
Group2

1. CondA - Session1
2. CondB - Session1
3. CondC - Session1
4. CondA - Session2
5. CondB - Session2
6. CondC - Session2


Considering the GROUPxTIME interaction: Is it correct to do a between conditions contrast at the second level in this way to get the same result as when removing condition C in the first level: 1/4 1/4 -1/2 -1/4 -1/4 1/2 (GROUPxTIME minus Condition C)?

Or should this condition be removed at the fist level, like in the corresponding SPM - Task analysis (to potentially make the results more comparable)?

Thank you in advance!!