Synonyms for Coinciding (same or very similar meaning)
WordNet sense 1 (occurring or operating at the same time):
coincident, coincidental, concurrent, simultaneous, cooccurring, co-occurrentWordNet sense 2 (occurring or existing at the same time or having the same period or phase):
synchronous, synchronal, synchronicWordNet sense 3 (coinciding when superimposed):
congruentFrom the ODE community, based on WordNetadd/edit