They're roughly the same amount, which is not the issue; the question is why on Earth would the Pelicans trade their all-D PG for a non-D, non-shooting SG/SF who is extremely ball-dominant, when they have a roster full of players to develop and already have Ingram at SF and Red , who they won't trade at least for the time being, at SG. There will absolutely be better offers from contending teams, probably including picks or young players, both of which the Spurs wouldn't be wise to include.
So, beyond FO re ation, which isn't the norm for New Orleans as far as I'm aware - which would be the great incentive that would make SA the primary suit in a DeRozan for Jrue trade? It's not even like you can sell DD as purely a big expiring since he's got a 27M PO for next season so even if, as you say, the Pels were so desperate to offload salary (which they aren't anyways since they're not in the luxury tax...) they would surely prefer a contract that ends this season without any additionals, again something many other FOs can offer.
So please, since you've analyzed the situation so thoroughly, please explain to me how the Spurs would be the primary suitors for Jrue - I won't even mention that it's a lateral move and clogs a position that isn't of urgent need for us - I'm curious.