For a very rough idea of how things would compare look at userbenchmark.com
So for the CPU the refurb comes with, a i7-2600 vs the Dell, i5-9400 https://cpu.userbenchmark.com/Compare/Intel-Core-i7-2600-vs-Intel-Core-i5-9400/620vsm735306
And for the graphics cards, the 1660 vs 1660 Ti https://gpu.userbenchmark.com/Compare/Nvidia-GTX-1660-vs-Nvidia-GTX-1660-Ti/4038vs4037
you can't imagine I have done this before :)
@Albb started
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For a very rough idea of how things would compare look at userbenchmark.com
So for the CPU the refurb comes with, a i7-2600
vs the Dell, i5-9400
https://cpu.userbenchmark.com/Compare/Intel-Core-i7-2600-vs-Intel-Core-i5-9400/620vsm735306
And for the graphics cards, the 1660 vs 1660 Ti
https://gpu.userbenchmark.com/Compare/Nvidia-GTX-1660-vs-Nvidia-GTX-1660-Ti/4038vs4037