How to change a specific objects settings across all pages

The simpliest way is to use object styles, you can specifiy position and size of any object. User that.

The master has also frame borders, where text frame aligned will be repositioned if those change. That’s why it is very important to align frames to these border lines. Changes of these borders will be reflected to object repostion.

>BTW Don't use PNG, there are much better file types: AI, PDF/X-4 or PSD.

Hi try this code for your reference:

/////////////////////////////////////////////////////
/// Here you can declare all those information like x, y axis value height & width and how much you want to move horizontally & vertically
var x = 13;
var y = 9;
var ht = 3;
var wd = 31;
var toMoveHorizontally = 3;
var toMoveVertically = 0;
/////////////////////////////////////////////////////
var myDoc = app.documents[0];
for(var p = 0; p < myDoc.pages.length; p++){
    var found = false;
    for(var t = 0; t < myDoc.pages[p].textFrames.length; t++){
        var frameGB = myDoc.pages[p].textFrames[t].geometricBounds;
        var height = frameGB[2]-frameGB[0];
        var width = frameGB[3]-frameGB[1];
        if(parseFloat(frameGB[0]) == parseFloat(y) && parseFloat(frameGB[1]) == parseFloat(x) && parseFloat(height) == parseFloat(ht) && parseFloat(width) == parseFloat(wd)){
            myDoc.pages[p].textFrames[t].move([frameGB[1]+toMove, frameGB[0]+toMoveVertically]);
            }
        }
    }
/////////////////////////////////////////////////////

Best

Sunil