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The park factor is based purely on runs scored and is basically a normalized runs scored metric with 1.00 being neutral.

The park effects (or hit modifiers) on a slight correlation to the park factor in that more hits and more extra base hits generally lead to more runs and vice versa, but given factors in run production/cancellation that aren't factored into the park effects (i.e., foul territory, field dimensions, defensive positioning for stadium effects, etc) parks with the same park factor may have wildly different and contrasting park effects.

So, like jfranco says above, while it was PB and SBC the stadium gave up fewer runs relative to the league per season than it has as ATT park, though it is still a more pitcher friendly environment than your average park.

The hit modifying park effects may have also changed slightly, but since they are rounded, we'll never know for sure.

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Maybe, but ultimately park factor as it relates to the sim is pretty much irrelevant. It isn't used at all and since run scoring is also determined by factors not affected by the hit modifiers of the park effects (such as BBs). personally I only ever look at it for theme league rules as a range to keep people from using extreme parks, in trying to determine if a neutral park plays more hitter or pitcher friendly, or if there are parks with similar or same effects (like your example) in seeing which one might trend more one way than the other. But, as it has no effect itself, unless the underlying hit modifiers also changed slightly (though not seen from the rounding), you shouldn't notice any difference from one to the other