There were two main groups of Brazilians that S&W shipped.
First Brazilian Contract Group (25,000 units), shipped beginning in 1938, serial number range: 181983 to 207043
Second Brazilian Contract Group (12,000 units), shipped beginning in 1946, two serial number ranges: (1) 166,000 to 175150 and (2) 207,196 to 209878.
If yours is one of the First Group, it looks to me like the stocks are correct. For the Second Group, they could be correct, but it seems S&W put various styles of stocks on the 2nd Group. Some folks think they were cleaning out the factory and just used whatever they happened to turn up.