Yes, they are nearly identical so one should not expect that crossing a homozygous Chilean Oocyan with the Chinese mutation type would cause an additive effect
He sourced some chilean stock that were pretty much mongrels.. cream Legbars get their blue eggshell gene from them
The chinese version of the blue eggshell is allelic to the chilean Oocyan mutation so you cant combine both gene to get a deeper blue color.
We can confirm the sex linked nature...