Replacing Multiple Smart Objects via Script

I am using the following script, but would like to edit multiple smart objectives within my mockup template file. Basically my template file has a desk coaster and a mouse pad. The issue is that my image files will be different sizes. Is there a way to modify the script or another automated process to develop the mouse pad & coaster with the same image?

// Replace SmartObject’s Content and Save as JPG

// 2017, use it at your own risk

// Via @10354895 B: https://graphicdesign.stackexchange.com/questions/92796/replacing-a-smart-object-in-bulk-with-photoshops-variable-data-or-scripts/93359

// JPG code from here: https://forums.adobe.com/thread/737789

#target photoshop

if (app.documents.length > 0) {

    var myDocument = app.activeDocument;

    var theName = myDocument.name.match(/(.*)\.[^\.]+$/)[1];

    var thePath = myDocument.path;

    var theLayer = myDocument.activeLayer;

    // JPG Options;

    jpgSaveOptions = new JPEGSaveOptions(); 

    jpgSaveOptions.embedColorProfile = true; 

    jpgSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE; 

    jpgSaveOptions.matte = MatteType.NONE; 

    jpgSaveOptions.quality = 11;  

    // Check if layer is SmartObject;

    if (theLayer.kind != "LayerKind.SMARTOBJECT") {

        alert("selected layer is not a smart object")

    } else {

        // Select Files;

        if ($.os.search(/windows/i) != -1) {

            var theFiles = File.openDialog("please select files", "*.png;*.psd;*.tif;*.jpg", true)

        } else {

            var theFiles = File.openDialog("please select files", getFiles, true)

        };

        if (theFiles) {

            for (var m = 0; m < theFiles.length; m++) {

                // Replace SmartObject

                theLayer = replaceContents(theFiles[m], theLayer);

                var theNewName = theFiles[m].name.match(/(.*)\.[^\.]+$/)[1];

                // Save JPG

                myDocument.saveAs((new File(thePath + "/"  + theNewName + ".jpg")), jpgSaveOptions, true,Extension.LOWERCASE);

            }

        }

    }

};

// Get PSDs, TIFs and JPGs from files

function getFiles(theFile) {

    if (theFile.name.match(/\.(png|psd|tif|jpg)$/i) != null || theFile.constructor.name == "Folder") {

        return true

    };

};

// Replace SmartObject Contents

function replaceContents(newFile, theSO) {

    app.activeDocument.activeLayer = theSO;

    // =======================================================

    var idplacedLayerReplaceContents = stringIDToTypeID("placedLayerReplaceContents");

    var desc3 = new ActionDescriptor();

    var idnull = charIDToTypeID("null");

    desc3.putPath(idnull, new File(newFile));

    var idPgNm = charIDToTypeID("PgNm");

    desc3.putInteger(idPgNm, 1);

    executeAction(idplacedLayerReplaceContents, desc3, DialogModes.NO);

    return app.activeDocument.activeLayer

};

//Alert Letting the User Know the Script Has Finished

alert("Finished!\nThe script has finished saving the jpeg thumbnails in the folder with the original mockup");