Those website calculators are quite bad at real world benchmarks. A 3600 is going to be better CPU wise than a 4600g, AMD has confusing naming schemes. The 4600g is mostly for igpu which you dont need since you have a 560.
A 3600 is roughly i5-10400 level, quite a big upgrade from an i3-7100, but will your 560 actually be capable of using the added CPU power? In CPU heavy games like modded Minecraft, factorio, x4 certainly. Games like cs2,valo also will see a noticeable improvement especially on all low settings.