The Terraforming Mars: Big Box Kickstarter included a massive "card upgrade pack" that effectively patched the entire game, including Prelude , with updated graphics and the most current errata.
Changes made to card text in newer printings to clarify rules or fix game-breaking bugs.
To fix the most common "print" issue—color variance on card backs—most veteran players use opaque-backed sleeves . This "patches" the visual discrepancy and protects the cards during the heavy shuffling Prelude requires. Why Prelude Remains Essential