Since they are "captives of the concept" that Jehovah is directing the Governing Body of JW's, they'd simply say that teaching children to give money to fund and support the organizations projects IS the same as teaching them to be generous to our heavenly father.
To them, this example is not comparing apples to apples. They view Catholics as part of Babylon the Great and anyone supporting them (even children) are supporting Satan, therefore when JW's ask for money....it's ok. When Catholics ask for money....it's not.