I think first we need to look at geographic factors on both side.
IAF/IA Combined have a pretty big AD Force but the area they need to cover is significantly more as well. For Pakistan we need to only have AD on our western border with India and along our coast. For india that is not the case. In addition to India's border with Pak and the LOC, india must also provide safety for strategic cities located around its coast i.e Jamnagar - Mumbai - Goa. Further more India must also provide AD cover to Nuclear Reactor Complexes and Strategic Weapon production facilities located at Hyedrabad, Bengaluru etc etc which are located way southwards in India. Then we have the whole Indian border with China which needs cover and therefore a considerable amount of AD needs to be placed to cover the Military facilities in India's Eastern sector, essentially everything located east of the chicken neck at Silguiri. The indian border with china is also much larger than on with pakistan therefore needs more AD as well.
Considering all these factors in view at the any given time IAF/IA should only be able to deploy at the maximum
50-60% of its AD force on the Pakistani border in case of a skirmish. While in case of full blown war that number would reduce to 40-50% of its AD force deployed along the Pak border as it would need to cover Chinese border equally as well as strategic prod facilities located deep inside in Central and southern india (e.g Hyedrabad, Bengaluru, Bhopal etc etc than the Nuclear storage sites located as well).
Even that deployment of
50-60% of its combined IAF/IA force is a very large number due to the sheer size of the AD force India possesses.
Now coming back towards the Pakistani side, PA AD and PAF AD both posses a significant AD force as well. However they only need to cover only the Pakistani Border with India and LOC primarily, as along the coast line to the west in pakistan theres not much that needs protection on the pakistani side, except the Gwadar port, and Jinnah Naval base. Both of which are already protected by PN Marines AD unit with 35mm Guided Guns and MANPAD detachments, so at max 2 or 3 AD Batteries would need deployment there by PA. While most Strategic Facilities in pakistan would overlap with AD units providing cover along the border due to again the short size of pakistan.
Therefore PA AD and PAF AD are able to deploy 80-90% of there AD force along the Indian border.
@Signalian @SQ8