History doesn't matter so I don't really care about the comparison. I think a Heat-Spurs matchup this year is worlds different than it was last year.
In the 2014 playoffs, Tiago Splitter is averaging 8 points, 9 boards, and 2.4 assists.
In the 2013 finals, Tiago Splitter & Boris Diaw collectively averaged 9 points, 4 boards, and 2 assists.
People seem to forget that in the Finals Boris engaged in a level of passivity that we haven't seen from him all year, making him basically unplayable. This year (and especially during this series) he's turned into a small ball killer. He's shooting 30% of his shots from 0-3 feet and he's killing it from there, shooting better (.800) than anyone on the team that's taking those shots often. And these aren't transition layups. I don't think it's a stretch to say that at this point, Boris Diaw is our best back to the basket player. Miami's small ball caught us off guard last year, but this year Boris will eat Shane Battier for breakfast. Their only hope will be to put their best defender Lebron on a Spurs role player and tire him out down banging down low.
As for Tiago I think it's safe to say that if he was able to keep Dirk and LMA in check, he will have no trouble against Bosh. Last year he routinely got his pounded on offense, and his Euro layup was basically just beach volleyball for the Heat. This season he's made a change not in his shot selection or strength going to the hoop, but in the way he sees the court and helps his teammates succeed. His playoff PER is 19.6, his TO% is one of the lowest on the team, he's giving us career high numbers in assists, and his ORtg is a stunning 139 in the playoffs. Thats 32 points better than the 2013 playoffs. I'm as shocked as anyone, but on offense Tiago has turned into one of the smartest BBIQ guys we have. He would be the best passing big on basically any team that doesn't have Boris Diaw.
In short, Tiago and Boris each averaged a pathetic 15 minutes in last year's finals. We have every reason to believe this year will be completely different. Having these two in their current form makes the Spurs a stunningly versatile team. If the Heat go big we can put Splitter on Bosh and shut him down without help, giving TD a break on Haslem so that he can help at the rim, allowing Green and Leonard to play Wade & Lebron straight. If the Heat go small, Boris allows us to stay big and will punish whoever they put on him; it would be foolish of them to put LBJ on Boris for fatigue and fouls, but it will be their only recourse.
Chalmers, Wade, Allen, James, Bosh is the only lineup that the Heat could presumably throw at the Spurs for which SAS will not have an easy solution defensively. Any of their other players at the 2-5 spot will give the Spurs exploitable advantages.
This is the lineup that spaces the floor so that Lebron can do that thing where he bullrushes the rim and gets a layup or a foul call. I think our best bet would be to put Boris on LBJ and make him a jump shooter, play everyone else straight, switch screens for LBJ, and hope that TD/Boris can punish their bigs on offense. I like the Spurs' versatility in this series a lot.