Compare the corresponding slots in the two voices.
PassiveActiveSlot
تُقُبِّلَتَقَبَّلَPast
يُتَقَبَّلُيَتَقَبَّلُMudhaari'
مُتَقَبَّلٌمُتَقَبِّلٌParticiple
The overall pattern remains recognizable; the internal vowels distinguish active from passive forms.