VIPER seem a practical solution based on in-house industrial capabilities which most probably will match with Pakistan's terrain and environment as well, as Pakistan is manufacturing and using M113 series from quite some time, at this stage we can assume based of official information that it was the only prototype which was shown in IDEAS-2018, so it might be still in development phase.
Ukraine might offer BMP series or some new derivative in which PA seems not interested, even it was reported that in trials for the selection of Turret for VIPER PA rejected BMP series Turret. Based on modular armour concept which VIPER IFV use it may provide better protection and maintainability as compare to BMP series, only thing in which VIPER lack behind BMP-3 is power/weight ratio otherwise comparable or excel in other parameters.
Same is the case with Turkish Tulpar IFV as it weight up to 42 tonnes powered by 850 hp engine, almost as heavy as Al-Zarar tanks of PA and does not carry anti-tank missiles, so it appears Tulpar is produced to address needs and employment concept much different than PA