Good afternoon all. Smelly requested that I drop in and give my two cents.
So, after some previous research this is what I have determined.
The first picture is that of a Brook Trout, Salvelinus fontinalis. The biggest hint is the blue halo that encircles the red spot. In addition, there appears what would be a black stripe under the jaw.
The second picture is unknown, except that it is a Salvelinus sp.
If the OP would like to know for sure, then they need to investigate the stockings for that specific body of water.
From what I understand, splake have not often been introduced into bodies of water with brookies in Colorado. Therefore, you should find one or the other present.
So... also to straighten out some misinformation... charr, salmon, whitefish, ciscoes, and trout, are all trout. They are in the same family of Salmonidae, in the order Salmoniformes. They are different genera, but in the same family.
In addition, splake do naturally occur. However, intentional crossing is often performed for management strategies.
I hope this helps.