Not going to get too in depth right now... but seeing the difference between pick 33 (almost 12M fully guaranteed) to pick 64 (A bit over 7M with less than 2M guaranteed) is a huge difference. Being on the hook for 2M instead of 12M isn't nothing. That matters a good deal.
Those are completely different contracts. If this is how things will be going forward it arguably changes the value equation for these picks.
I know the same can be said about picks 1-32 which are drastically different in price (pick 1 being worth almost 49M and pick 32 being worth 14.6M. The difference is though many of those top 10 picks (49-26.5M) go to premium positions anyway (QB, WR, CB, LT) which cost a ton of money making them more palatable. And there there is a usually a huge and clear talent difference between picks 1-5 and picks 28-32. It makes the extra money make a lot more sense.
While there is a difference between pick 33 and pick 64 it isn't nearly as big as the first round. The positions are all over the place as well. The picks are more likely to bust and there is a huge difference between being on the hook for 12M vs 2M with those riskier picks.
This isn't to say i don't want the highest picks possible. But if you look at the pick position as a whole (contract and all) IMO this shrinks the value difference in the 2nd round. Trading down now lower into the 2nd has a hidden extra value in doing so.
Trading pick 33 for picks 59 and 64 is equal value by the chart. But now those two picks only cost you less than 4M guaranteed vs almost 12M. That to me makes this trade a slam dunk win for the trade down.