>>6306Pretty sure SEED was openly inspired by 0079. It just, y'know, sucks.
Anyway, most Gundam series are pretty different from the others - at least the ones that are typically held in high regards. Even 0079, Zeta, and ZZ - direct continuations of the same story - have very different tones and stories. Yeah, there are some themes and motifs that show up more than once, but that's pretty much inevitable when you've got so many series and OVAs.
The only time I could really see this applying is when you look at the designs of the Gundams themselves, which do tend to have a bunch of elements in-common across the different settings.