Well, CPU is better, former king of gaming (until R7 9800X3D released).
Despite R7 7800X3D being gen older than R7 9700X, in gaming, you still get ~15 FPS more with former king;
View: https://www.youtube.com/watch?v=ANEOIfkU9qI
MoBo is still weak part of the combo, 8+2 VRM phases and the same lack of PCI-E 5.0 support (as Gigabyte above, Asus also has just one M.2 PCI-E slot, while the rest, including PCI-E x16 slots are all PCI-E 4.0),
specs:
https://www.asus.com/motherboards-components/motherboards/tuf-gaming/tuf-gaming-b650-e-wifi/
And the RAM is very same as in previous combo.
The more phases VRM has (including proper cooling) - the more stable power CPU (actually entire PC) can get through MoBo. Having more VRM phases is especially critical for high power consumption CPUs, even more so when you OC the CPU.
Here is good Q&A about VRM:
https://www.lenovo.com/us/en/glossary/vrm/
If you looked the B650 MoBo roundup, there are few MoBos with mere 4 phase VRM. Then one has 6 phase VRM. Followed by 8, 10 (one MoBo), 12 (most MoBos), 14, 16 and ends with insane 24 phase AsRock MoBo.
So, in B650 lineup, MoBo VRM phase selection is: 4, 6, 8, 10, 12, 14, 16 and 24 (namely 24+2+1). Since Ryzen 7 is high-end CPU (regardless if you go with 7800X3D, 9700X, 9800X3D), i'd pair such high-end CPU with minimum 12 VRM phase MoBo. While more would be better. (As i said earlier, i'm pairing my 9800X3D with 20+2+2 VRM phase MoBo. While the current MoBo what i'm using, from 2016, MSI Z170A Gaming M5, has 12 VRM phases.)
From the Lenovo link i shared above, you can read what issues may arise when you skimp over VRM phases. So, your call if you want to get weak MoBo (VRM) with your high-end CPU.