Two different things. It cuts both ways you could be a bad person with high moral standards, or a good person with loose morals.But isn't determining whether or not someone is "good" a function of morals? I don't see too much of a distinction.
One is singular, the other with the "s" is plural. I'm not sure what you're not understanding. You can have a high moral code or you can have loose morals, I don't think you can have both, it's a one or the otherI don't think what you're saying makes much sense without first making an effort to define "moral" and "morals".
By making that statement, you suggest that you fail to grasp that the notion of "morals" is not a universally-understood one. For example, there's a common notion that's often floated by people who should know better that the source of all moral authority is biblical. As an atheist, I think that's nonsense, and am much more aligned with what Sam Harris argued in The Moral Landscape, which is that it is a naturally-occurring instinct, as it can be experimentally shown to exist in primates (who, to the best of the researchers' knowledge had not read the Christian bible (or any other religious tract)).
So I'm going to say it again: Until you've defined what you understand to be moral(s) - which, I'll point out grammatically is not simply a singular/plural construct i.e. a person is moral (adjective), but speaking of a person's morals indicates the word is instead used as a noun - it's very difficult to have a meaningful conversation on the subject at all.
being a moral person
I suggest some readings below since you are an avid reader and open to ideas! These are many criticism levied against Harris by actual experts of the topic.
But if you're asking someone to define and defend their concept...
Try replacing moral with rules. A moral person sets rules, expects them to be followed, and there will be consequences if they aren't. Creed? Code? As long as you follow their rules, they aren't dangerous peopleWhat does that mean, exactly? Is it like obscenity - you can't define it, but you know it when you see it?
Underground Railroad, doesn't matter if it was the northern route or the southern route, is a perfect example. People that helped were moral people, doing what they thought best, knowing there was laws and consequences if they got caught.This reminds me of the D&D alignment chart. Lawful-ness is one axis, and good/evil is on the other. IMO this is a more accurate reflection of reality than assuming a "moral" person will follow rules and vice-versa, or assuming that rules are "moral" in the 1st place.
Example: Slavery was (and is) usually legal in places it is practiced, despite being IMO immoral. A slaver is still a danger to their slaves, even if everyone is "following the rules".
Perhaps what you mean by "moral" is closer to "Lawful-ness" in the D&D sense?