Many of the elements are similar.
There's Wall and Beal. Wall this year will presumably be somewhat worse than the 2017 version, but Beal is better, so that may be a wash.
Both teams have a ridiculously accurate sharpshooting forward. Bertans is an even better shooter than Porter (when factoring his range, quicker release, and ability to shoot with the defender close), but Porter was the much more well rounded player - a decent man defender and a very good help defender.
Interestingly, while I assumed that Hachimura would be the weak link in this comparison, it turns out he is actually quite similar to Markieff Morris statistically per 100 possessions. Morris is a better 3-point shooter and a slightly better rebounder, but Hachimura turns it over less and fouls less. If Rui brings his 3-point percentage up and makes the expected improvements in D you typically see in a 2nd year player, he might actually be better than Morris. Of course, that's damning with faint praise.

Bryant versus Gortat is interesing. Offensively, Bryant is better at everything statistically, though it's difficult to quantify how important Gortat's screening was. Gortat is the better rebounder and defender, but Bryant could approach Gortat's level as he figures the game out. It's not like Gortat was a fearsome rim protector or anything. He was just a big guy who knew where to be and what to do.
The 2016-17 bench featured Bogdanovic (before he made a jump in production), Oubre (as a relatively ineffective 2nd year player), a rookie Satoransky who couldn't shoot at all and hadn't really figured out the NBA game, and Jason Smith having arguably his best season as a pro. There was a parade of ineffective backup PG's with Brandon Jennings, Trey Burke and Sheldon Mac.
The 2020-21 bench will feature Troy Brown, Ish Smith, Isaac Bonga, and our #9 pick, plus probably a veteran big they acquire in free agency. They've got nobody as good as Bogdanovic as a 6th man, but they may be better 7 through 10. (I realize that they may start Bonga and bring Bertans off the bench, but I think it makes sense to compare the teams assuming Bertans is starting since he will ultimately play starter's minutes.)