Try reading tea leaves it would yield better results. Anyone that says they know is guessing (thats being kind).
Exactly all though CC do have different internal algorithims to determine your limit. It all comes down to credit score, income and DTI ratio and your percieved risk.
While there are stories both ways, it still seem more likely to me that "X matched my limits" is more likely related to the current state of your credit report. If issuer 1 gave you $Y and issuer 2 gives you a CLI to $Y (or a new card with $Y) it could just be because that is the "right" limit for that CR.
I also believe this is behind the more general "high limits cause more high limits"