I possibly found a point to use the helmet with DAZStudio. I replaced all "Helmet:2" of Helmet.cr2 by "head:2". And replaced all "Belt_1:3" of Jet Pack.cr2 by "chest:3". They are working well with DAZStudio4 now. They fit Pippin automatically.

Helmet is working well with Poser7, too.
But I don't know why Jet Pack is still strange with Poser7.
And I don't know whether all Poser7 users have the same matter.
I think that probably cause is only my environment.