FCValuesSynchronizedQ[{val1, val2}, type] compares
definitions of val1, val2, … between the
master kernel and the subkernels and returns True if all of
them identical. Supported types are
DownValues, UpValues and
OwnValues.
This routine is only relevant in the parallel mode of FeynCalc. It helps to avoid inconsistencies through definitions that were introduced before activating the parallel mode and not correctly propagated to the subkernels
Overview, DataType, FCScalarProductsSynchronizedQ