Well, it can't be much, since the skills at HW are not the skills we have now.
Iirc asylum was 52, so if that got moved, then changing it further shouldn't matter a big deal.
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Lilies didn't exist in HW, and didn't work as they do today until ShB. Solzce being at level 52 has no connection to the Job quest since it wasn't invented/added to the game until two expansion later. If that makes sense. I think when they added it in ShB, it was gained in the 60s or even 70s, they just backdated it to 52 at some point (maybe EW, I honestly am not sure on that one since my WHM was already at 70 for 5.0 and 80 for 6.0...)
Agree on SS/Protect -> DB/Aqua. Didn't think about Divine Seal, but yeah, makes sense to me.