Oh monetary boards in some of the Latin American countries, like the Dominican Republic, Nicaragua etc would change printing companies like underwear. Some of it may have had to do with the fact that from time to time these countries may not have actually paid for their note orders - so they skipped town and went to another printer. So variations in design happen, I can point this out with Nicaraguan notes in the middle 1950's - they went back and forth betwixt ABNCo and TDLR - and of course printing plates are proprietary to that particular company so the new contracted company would have to do their best to re-create the design. One thing I notice with the ABNCo printed notes is that the intaglio was deeper, the inks a bit darker and the design a bit more refined than the early TDLR notes - and maybe this could explain why ABNCo lost the printing contract - more expensive.
I can only surmise that it is a similar scenario with the Malaysian note - TDLR got expensive and they went with BA, I don't doubt that Malaysia can pay it's bills in contrast to the Latin American countries though.
As for proprietary plates and designs, one exception I can think of was the Canadian Banknote Company after it was spun off from ABNCo in 1918, they continued to share stones and plates for certain designs that were historically used on Canadian Charters, even Bank of Canada notes - and some of the vignettes stones were also used on Latin American, and even Russian notes by ABNCo into the 1940's.