In Java Edition, the maximum number of deepslate diamonds in blobs appears to be greater. After using several commands across the two versions, it has been found that the blobs contain greater amounts of deepslate diamond ore blocks than in Bedrock. In Bedrock, the maximum is fairly large however I have not found a 20-ore vein in Bedrock even after removing all blocks in a world via commands besides deepslate diamonds. In Java, I have found up to 20-23 if not exposed to air, but in Bedrock, it is usually up to 10-15, if not less.

The image provided is from Java Edition. No mods, addons, etc were used, only texture packs.