Mirelurk hatchling base size

I don’t know if this is intended or not, but it seems pretty odd.
When the radroaches came out, the errata came later with an added line about the base size for the 2 kinds of radroaches (the model is 40mm but counts as 30mm for ruling purposes now).
Now, Mirelurk hatchlings seem pretty much the same (they are little critters and come in groups like the radroaches, and the attack is very very similar), but actually, the model has a 40mm base and it counts as Large, and they are too cheap… they could infest the table and offer a lot of covers.
Is this fact intended (counting the hatchlings as Large)?

We will give the hatchlings the same rule as the radroaches

Kind regards