Summary:

In a ruined portal the chance of obsidian being replaced by crying obsidian is 0.15 on java but 0.20 on bedrock.  

Is this difference intentional and if so why?

To Confirm:

For bedrock see: RuinedPortalPiece::_maybeReplaceBlock

For java see: net.minecraft.world.level.levelgen.structure.templatesystem.BlockAgeProcessor (method: maybeReplaceObsidian)