It's hard to say how much better but for sure some improvement.
I recently went from
[email protected] to 4x8
[email protected] and it was around 10% less performance, but I'm 1st gen ryzen, pretty sure the newer chips and boards deal far better. You would see an improvement between the different speeds, but by how much Idk.
If it was me I'd say try your current ram with the new kit and compare online, your not have any issue running higher ram on newer kit, but you need data to really know to judge the value to yourself.
I do kinda regret not going G.Skill but at the time they sure were pricey
I think with all tech related things it's the difference between want and need, but imo your current ram will be fine for you to use and you can always upgrade it if you think you need too at a later date.