it depends
first you have standard fission uranium warheads. theses nukes are quiet useless as they are heavy and don't have the yield of plutonium warheads, which is next.
plutonium warheads are more powerful then uranium. this means you can have a plutonium warheads thats has the same yield as uranium but it will be smaller warhead.
spiked warheads
now this is common with plutonium warhead mainly. this mean when you give a nuke an accelerant. in this case it's tritium. this increases the yield 3 to 4 times, dependant on design. this is only for fission devices only though.
fusion devices are many times more powerful than any fission device, i'm not going to talk about that.
pakistan was initially known to first to poses uranium warheads which the fuel came from kahuta and krl. my personal guess would be the yeild would be around 65kt on the high end and 35kt on the low end. now we have seen more reactors being built a kahuta which are known to be plutonium. this is more difficult to estimate as i dont know how it was made. or if it contained tritium. but nasr nukes yield would vary from 0.8-5 kt and the larger shaheen would vary from 125 kt to 375 kt. again it's dependant on the design and how it was made.