You're right. It's a pity most manufacturers don't do their animals in scale to each other, but in this case it's not so bad, because 1:22 is a common scale a lot of collectors do like.
BTW: I also thought that the smaller sized Animal Zoo series were made by PNSO, but obviously they aren't. There is no PNSO logo to be found - neither on the figure nor on the package. It says Yiniao.