I'm sure someone else can point out a better way to accomplish what you want, but if you go the SDK route, here is how you would copy the text/location data from one document to another:

DocumentInfo srcDoc = Document.GetDocumentInfo(srcDocID, session);
DocumentInfo dstDoc = Document.GetDocumentInfo(dstDocID, session);

if (srcDoc.PageCount == dstDoc.PageCount)
{
    foreach (PageInfo srcPage in srcDoc.GetPageInfos())
    {
        PageInfo dstPage = dstDoc.GetPageInfo(srcPage.PageNumber);

        // Copy the page text
        using (var txtReader = srcPage.ReadTextPagePart())
            dstPage.WriteTextPagePart(txtReader.ReadToEnd());

        // Copy the word locations
        using (var locReader = srcPage.ReadLocationsPagePart())
        using (var locWriter = dstPage.WriteLocationsPagePart(srcPage.LocationsDataSize))
        {
            for (int i = 0; i < locReader.WordLocationCount; i++)
                locWriter.Write(locReader.Read());
        }

        dstPage.Save();
    }
}