You can not just replace the sugar with a sweetener and expect the same taste. Every sweetener are also bitter and have a taste to them. So replacing one ingredient does change the taste profile of the soda. So sugar free versions of sodas usually use a different formula. There are different ways of doing this though. You can either try to match the non-diet versions taste as close as possible. Or you can just try to make it taste as good as you can. In addition there is some irrational preferences to different sweeteners so in order to cater for everyone you want different sugar free variants using different sweeteners available. This gives a lot of options which is why you see a lot more sugar free variants of soda then the original versions.
I am not quite sure exactly what the differences between the Dr. Pepper variants are. The formula for Diet Dr. Pepper dates back to 1962 and have sometimes been marketed as tasting just like the regular and sometimes marketed as tasting differently. Dr. Pepper Zero Sugar was only launched in 2021 and they did try to make it as similar to the original taste as they could. A lot of the variants of Diet Dr. Pepper was replaced by the equivalent Zero Sugar variants at the same time but Diet Dr. Pepper still remains in its original formula.
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