Well yeah, the money's the same but the minutes might not be. While it's obvious that Splitter likes being paid, he also clearly likes being on the court.
If both teams are offering the same amount of money but one is telling him he has a fair shot at getting 25+ minutes a game, then I suspect Tiago will go for the court time. Especially if the pieces are there for a playoff run imo. I think if his agent told the Spurs to back off or otherwise forced some kind of provisions into his contract, they'd respect that.