To be precise, every rule change in a game has the potential to also change the index numbers that are appropriate. Fortunately, most numbers don't change that much. Wong's book Professional Blackjack for example has charts of index numbers for single deck and for 4-deck games (and separate versions of each for H17 and S17). Many of the numbers are identical, and only a handful change by much.
Custom generated indexes for a specific game are the most accurate, but you'll need software to do that. For most players, you'll be just fine using any decent chart, with the knowledge that it won't be perfect.