The Estates-General of 1764 would bear little resemblance to its OTL 1789 counterpart. None of the preceding events have occurred - no grande peur, no failure to reform French finances, no May edicts to abolish the parlements, no conservative reaction and tiers etat alliance with the parlementaires and resulting crippling of the Bourbon monarchy's momentum, and so forth. It just would be a very different situation.