HIMARS isn't just a system, but a doctrine. With HIMARS, you'd quickly fire off your missiles in a canister, dump the canister, move, and then load a new canister. You need pre-designated or pre-set launch points with canister stores ready to go for the HIMARS system to use.
Pakistan's system is similar to HIMARS in that it involves different types of guided rockets (230 mm, 400 mm, possibly 122 mm one day), but it doesn't seem to have the modular canister/pod mechanism. So, the Pakistani system may fire several rockets, move to a different location, fire again, and repeat until it runs out of ammunition. The re-load process would probably require more time than the HIMARS as it's entire point is to have modular pods/canisters ready to load.
I was thinking, can PN make use of locally produce HIMARS (Fatah-II). I searched and found idea is already out there since long (https://apps.dtic.mil/sti/trecms/pdf/AD1176127.pdf)
Fatah-II launcher should not take much space on warship and perhaps can be used against enemy coastal positions / radars / ports and perhaps against even the enemy fleet just to confuse the enemy air defense. Just giving an idea on naval application for Fatah-2, not sure at the moment of its effectiveness though.