Hebrew linguists, is there any difference in pronounciation between the kubutz vowel and the shuruk/melupum?

Kubutz (Hebrew: קֻבּוּץ‎) is a Hebrew niqqud vowel sign represented by three diagonal dots "ֻ" underneath a letter. Shuruk (Hebrew: שׁוּרוּק‎) is another Hebrew niqqud vowel sign and it is represented by a dot in the middle and on the left side of a Vav "וּ". In Modern Hebrew, both signs indicate the phoneme /u/ which is the same as the "oo" sound in moon and is transliterated as a "u".