I believe they are the same cartridge by Johnson, there was a 22 carbine wildcat too. Johnson really attempted to interest the military in the 5,7mm, advertised 3000 fps with a 40gr bullet but
the 222 Rem Special was just about to surface and the rifles.

Lake City 7,62 NATO blanks work really well being formed into 7,92x33, some even leave the primers if unfired