The retro parks of the Nineties are now moving into full maturity; they've all undergone a couple renovations and developed something of personalities of their own.
Which is a damn good thing, because as originally constructed, the retro parks were far more identical and cookie-cutter than the widely-derided multipurpose ashtray stadiums of the 50s/70s they replaced.
Basically seat colors, scoreboard location, and minor variations in fence distances are the only differences in the retro parks -- along with exterior brick colors, ornamental trim work and the exterior outfield scenery.