Question about grex names.

[plantluvver]

I am slowly learning more about what a grex means. Initially, I thought it was a shorthand for the entire pedigree of an orchid, but found I was somewhat mistaken.

What if we do crosses, (AxB)x (CxD) and also (AxC)x (BxD)? The progeny of both crosses will have 25% parentage from each of parents A,B,C, and D. Would these be considered the same grex?

And if they are not, is there a name for this relationship?

Also, would we expect or not expect the progeny to be just as similar as siblings?