Sort of. I got catch a dragon type for 3 rare candy when the usual reward is a Dratini encounter. Hatch 5 eggs has always been chansey. Also both are rare.
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Catch a dragon has always had multiple available rewards. I've gotten it for a reward of 10 ultra balls before. It's such a rare research and tough to complete depending on the available raid bosses that it doesn't usually get called out unless it's for an encounter.