Figure shows the makespan gap between baseline and optimal MILP schedules along with corresponding assignment/sequence difference values. The values of assignment difference range from 0 to 25.5%, with 95% of them being lower than 21.5%, indicating the baseline schedule is not very far away from the optimal schedule in terms of operation-to-module assignment even for large libraries. In contrast, the operation sequences on modules from baseline and optimal schedules can differ significantly, as indicated by the high sequence difference values (averaged at 0.43, or 0.53 when libraries of size 1 and 2 are excluded) especially for large libraries. For very small libraries, a strong correlation between assignment and sequence differences is observed, which is weakened and eventually vanishes as the number of targets (library size) increases. These results suggest that the current baseline scheduler can approximate optimal operation-to-module assignments but struggles with approximating optimal operation sequences.