I get the names mixed-up myself.

In one of my 35 year old "pre-spreadsheet" typed inventories, I listed my Speed Six as a Security Six.

Good thing I noted the model number: GS-32.
Despite being a hard-core S&W revolver collector at the time, the Speed-Six was good enough that I went on to purchase a Ruger Redhawk .44 Magnum in lieu of an S&W Model 29... but I later came to regret that decision dearly once barrels started flying off the Ruger Redhawks at an alarming pace...

... with Ruger refusing to do a recall.
Took me a long time to get over that mistake and to consider buying Ruger products again.