Manuel,
welcome to the DTBB.
All 3 pans are close if not identicle. Armando is a former Aviaid employee. The PI pan looks identicle to the Armando pan, it is most likely manufactured by Armando.
They are good pans incorporating baffles with trap doors, a windage tray, and a scraper. They are absolutely a "must have" for a Pantera that will driven in a "sporting" way from time to time. Good choice.
your friend on the DTBB