2d10 is just 1d20 with some scaling.
Namely, DCs are ~0.5 lower, modifiers are SD(1d20)/SD(2d10) =~ sqrt(2) larger.
(VAR(1d20) is 399/12, VAR(2d10) = 2VAR(1d10) = 192/12, so VAR(1d20)/VAR(2d10) = 399/192 =~ 2. SD is the square root of variance.)
https://anydice.com/program/42b2b
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