Is there any connection between the Gundam series?
you have many gundam series with connections!
For example, Gundam 79, the first one, is in the same chronology line with Z, ZZ, stardust memory and others. this series are differents, but in the same line, in the same conflict (AEUG vs Zeon)

But, Gundam Wing, Seed, build Fighters...are differents.

You can follow this example: