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Do you have a link for that online version? I tried Googling and there were lots of dodgy looking links.
I'd wait a little before attempting to answer that question. Perry figures can vary in size and bulk even within a given range. Not long ago, I ordered a Perry Napoleonic French Old Guard Eclaireur command pack with the intention of using the officers as colonels and ADC's for both the Napoleonic wars and the 1st Carlist war. It turned out that the sculpts (Alan's) were noticeably bigger than the FCW figures (Michael's) and even some of Alan's earlier Napoleonics. Give Nuno a few weeks until the first batch of Perry figures is released and I am sure he'll produce some comparison pics.
I wonder who had heard of it before this?
The best modern Portuguese history of the war is Maldita Guerra, by Doratioto. It puts to rest a lot of hoary myths: https://www.goodreads.com/book/show/3386435-maldita-guerraThat battle was particularly interesting, because several of the Afro Brazilian prostitutes who were with the column fought the Paraguayan cavalry to pull the Brazilian wounded to safety under the wagons. Think about the modeling possibilities...