Hi, and welcome to Colt Country!
Your replicas are "brasser" models of 1851 Navy revolvers, one in the true "Navy" caliber of .36 and one in the "Army" caliber of .44 (Colt never manufactured the Navy model in .44 cal, nor produced a brass framed model, though some Confederate copycats did)
Either way, they should be good shooters if you don't exceed the maximum recommended loads of:
.36 cal-20gr 3F
.44 cal-25gr 3F
Most likely, you will find they will shoot more accurately with lesser loads and you will save on powder as well. Do a thorough inspection of the arbor (for tightness and security) and recoil shield (for denting and imprinting from the cylinder teeth) before shooting. If you need any help in this area feel free to ask myself or any of the other members here how to ID problem areas. A well-maintained brasser should be able to last a lifetime of shooting enjoyment if not abused or mistreated.
BTW...your .44 appears to be missing a front sight?