Yes, the Krupps were a little lighter than the postwar Baldwins, the difference on the drivers, where it counted, was about a ton. I'm not certain that the "as delivered" copper fireboxes on the Krupp locos lasted until the end. I do recall being told about them by Ben Turtin on my first visit in '71. Nonetheless, I feel that they were fine machines. They also had those oval shaped ventilators on the front of the cabs as well as that easy to recognize roof profile.
Most of the Guatemalan locos that I got on all had the backup position on the sanding valve piped up to the air ringer on the bell! There was no way to adjust the flow on the Sellers lifting injectors, the lever was usually gone. Most all of the valve handles in the cab were always replaced with a piece of flat stock. No control for the damper either. The whistle lever was usually counter-weighted and made for really fine control. Nearly every whistle on the property was a flat top 3 chime...two exceptions being Krupp 167 which had a step top cast 5 chime & 182 which had a 5" Lunkenheimer chime. Some things I still remember well.