That '70s Show season 4, episode 5, "It's a Wonderful Life," revealed the future of Eric and his friends if he and Donna had never dated, and it's very different than the futures seen in That '90s Show. The spin-off is set about 15 years after the events of its parent series, and though it centralizes the children of the original group of friends, it also displays what their adult years have looked like. Back in the days of That '70s Show, the writers had speculated what the following decades would have held for the cast— but with a twist.

https://screenrant.com/that-90s-show-70s-wonderful-life-alternate-future-comparison/