The 5500GT/5600GT are fairly new processors. Whatever that "CPU Mark" score is, there are likely not many user sample comparisons to get a true indication which performs better. Being that the ONLY specification difference in those processors is that the 5600GT has a 200MHz higher boost clock, it should be slightly better performing when comparing to the 5500GT in an otherwise identical system.
Note that both the 5500GT/5600GT are based on the Cezanne architecture compared to similarly-priced Vermeer processors such as the 5600/5600X. While Cezanne is capable of higher IMC clocks, Vermeer has twice as much L3 cache and supports PCIe 4.0
Ryzen R7 5700X | B550 Gaming X | 2x16GB G.Skill 3600 | Radeon RX 7900XT
Ryzen R7 5700G | B550 Gaming X | 2x8GB G.Skill 4000 | Radeon Vega 8 IGP
Ryzen R5 5600 | B550 Gaming Edge | 4x8GB G.Skill 3600 | Radeon RX 6800XT