Pakistan's military doctrine is geared toward fighting India conventionally and lately experienced in COIN campaigns as well. Its army and air force are planned for both defensive and offensive operations inside India.
Israel's army is almost entirely defensive. It's air force is capable of delivering serious firepower in neighboring countries.
Both navies are incapable of formidable-enough deep water strikes.
Neither has strategic missiles capable of striking each other.
The distance between the two countries is approximately 3000km
Israel's air force cannot strike as far as Pakistan and even if it could - it can't possibly traverse through Iran or KSA.
Pakistan's air force (AFAIK) is not capable of striking Israel from Pakistani soil.
Without involvement of third-parties (US, India, Iran, Iraq, KSA, China), I would think the conflict would be restricted to proxies alone.
With KSA, Iran or Iraq on our side, we could deploy assets remotely to strike directly at Israel.
Israel does not have this advantage. No one (except India) would be willing to host Israel in this region.
How far would India go to support Israel? Hosting Israeli assets for strikes into Pakistan is the same as an Indian strike itself. Would India risk war to support Israel against Pakistan? At risk of involving China?
KSA and Iran might use the opportunity to strike at Israel via their proxies (or each other).
All in all, I think this would make an interesting discussion.
I just hope we can discuss it objectively
A glance at the geography of the region: