The difference in pH between an acid and a base is the measurements on a pH scale. An acid is below 7, and a base is above 7. When they cancel each other out its a 7, which is neutral. An acid is a proton donor, while a base is a proton reciever. pH= -log[H+] and pOH=-log[OH-]. The relationship between pH and pOH is that they both equal 14. The product of the concentrations of hydrogen ions and hydroxide ions equals Kw. pH indicators are substances, usually a weak acid or base, that changes color depending on the pH of the solution it is mixed with. Indicators don't change color sharply at one particular pH level. They change over a narrow range of pH. And this color change interval is different for each indicator. The difference that we observe between UI and other indicators is the composition of the indicator whether it is a base or acid and the color. I would choose different indicators. Although a pH of 5 and pH of 9 might seem close, they are very different on the pH scale, so it would be better to use different indicators. Indicators react with the hydrogen or hydroxide ions in the different substances. They change its formula and color to qualitatively show a pH or pOH scale. Most indicators only show a certain range of colors like Methyl orange or meta cresol, because of its limited pH indicators. The UI has the ability to show all the colors on the pH scale whereas Methyl orange could only show colors ranging from red to yellow and bromothymol blue can only show colors ranging from yellow to blue.
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