Most games still prefer higher clock speeds over more cores.
Switching from 6 cores to 8 cores will not improve the game-performance itself,
but might (for some games) improve desktop usability / less loading times,
for multitasking / multi-window work.
These processors are from the same generation, so the "upgrade" would not do much.
My best guess is: stay with the 6 core CPU at higher clock speeds for gaming use.
--- [ CPU: Ryzen 7 3800XT | GPU: ASRock RX 5700XT Challenger Pro 8GB | driver: 24.1.1 ]
--- [ MB: MSI B550-A Pro AGESA 1.2.0.7 | RAM: 2x 16GB 3600-CL16 | chipset: 6.01.25.342 ]