Want to point out that PSO2 is not confirmed to be using Hedgehog engine. There are claims that it's a derivative of the PSU engine (which itself is dubious) but there is as far as I know little in the way of evidence to support either claiim.
That said, judging by the capabilities of the Hedgehog engine the prime features it has are its light-mapping and light-field technology; both of which are things that PSO2 lacks. Let's cut them some slack and assume for technical reasons light-mapping would be impossible to incredibly impractical for use with levels built from randomized blocks, it still seems safe to me that if it was the Hedgehog engine the lighting in PSO2 would be significanty better than it is. This does not 100% rule out that it uses Hedgehog engine, mind. For that, we'd need to compare tokens between PSO2's exe and either Unleashed or Sonic Generations or some other Hedgehog Engine game to be sure.
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