I'm not sure if MCPE-144078 is still an appropriate place for ore generation parity issues, since it has not been updated for two years, and it doesn't mention ore blob size. So I created a new issue about parity on iron ore blob size in the current versions.

Bug:

A normal iron ore blob is in size 9 (at most 13‌ iron ores) in JE, but in size 10 (at most 16‌ ores) in BE.

It can be checked in "assets/behavior_packs/vanilla_1.18.0/features/iron_ore_feature.json" file.

History:

This issue was introduced in 1.18.0.20, released on October 6, 2021. At that time, the newest version of Java Edition is 21w39a. In 21w39a (and current version), iron ore has a patch of blobs in size 9 that attempts to generate 10 times per chunk, and diamond ore has a patch of blobs in size 4 that attempts to generate 7 times per chunk.

In 1.18.0.20, many ore generations were tweaked to match Java Edition. However, for iron ore and diamond ore, there were two changes: The size of normal iron ore blob was changed to 10, and the size of normal diamond ore blob was changed to 7.

As a result, in 1.18.0.20, iron ore has a patch of blobs in size 10 that attempts to generate 10 times per chunk, and diamond ore has a patch of blobs in size 7 that attempts to generate 7 times per chunk.

I'm not sure if this was intentional. However, for diamond ore blob, its size was changed to 4 in Hotfix 1.18.1 and Beta 1.18.10.22. So that it matches Java Edition now.

However, normal iron ore blob size is still 10 in current versions, which doesn't match Java Edition.