Mishnah Berurah — משנה ברורה

Only on a rabbinic level - Even though you need to make a blessing on a מצוה which is on a rabbinic level too, nevertheless there are practical differences in regards to several things. 1. It's more fitting to make a garment with which he can fulfill his obligation on a Torah level. 2. If his ציצית which were spun for the sake of the מצוה got mixed up with ones that were not [spun] for the sake of the מצוה and he has no other ציצית... or if he has a doubt regarding the garment, if it's obligated in ציצית... If it's [ציצית made from one of the other species which is only] on a rabbinic level, [then we say that when we have] a doubt [regarding a] rabbinic level [מצוה], we are lenient. 3. If he's sitting amongst others and one of his ציצית strings tore [and it happened] on a weekday... if [we say that ציצית made from one of the other species] is [only] a rabbinic level [מצוה], then we can say that for [the sake of] man's dignity it pushes off the rabbinic level [מצוה] and he is [then] not obligated to immediately remove his טלית. See [further] in Siman 13 and [there are also] many other practical differences ... see in Pri Megadim.