Yes. All four Gospel writers indicate that the meal took place right before the Passover
(Matt. 26:17-19, Mark 14:12-16, Luke 22:8-13, John 13:1-2). Only in John is there ambiguity that the “Last Supper” specifically was a Passover meal. Given the certitude of the synoptic Gospels on that fact however, it may be that John did not feel the need to focus specifically on whether or not the Passover meal was a seder.
Although the Last Supper was indeed a Passover meal though, we cannot say with certainty the exact form it took, and to what extent it was similar to or different from Jewish seders today. We can say that there are indeed differences because many of the distinctive modern rituals of the seder are later developments (e.g., the Elijah cup was of medieval origin). Although it must be affirmed by Catholics that the Last Supper is the fulfillment of the seder and the origin of the Mass, both the modern Jewish seder and the Mass differ significantly from the Last Supper in format due to the development of transitory human customs in their celebration.
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