Mochino is a combination of het mocha and het albino. Mochino x albino would give you half mochinos and half albinos.
I don’t understand your second question exactly, but I think it has something to do with single-gene examples of a co-dominant trait. Feel free to rephrase it so I can answer your question more accurately.
Yes, 50% het, 66% het, these terms are universal. The basic fundamentals of genetics do not work differently in different kinds of snakes, although morph names may not mean the same thing, since they are essentially arbitrary.