If we can vouch for an F-7 sized fighter to be harder to detect vs an Su-27, both armed with external weapons, the same would apply for a low-observable fighter. It maybe be larger than an F-7 and carry weapons externally, but still might end up with a smaller radar cross-section depending on its design and systems.
In the Indo-Pak context, its unrealistic to think PAF will have all stealth fighters. Project AZM, if it comes to fruition, will not be for a token buy of 40-50 aircraft where you could say sure, just have all weapons internally. It will be a replacement for over 80 F-16s and possibly be inducted in 150+ numbers in the long run. Thus, a design such as the Korean one, with recessed weapons among other features is the most likely scenario with PAF.
This goes both in line with the design philosophy at PAC and PAF, where keep it simple is the mantra for success. Having an aircraft that recessed weapons bay only serves to increase costs and complexity and given that those internals bays would be useful only for carrying a few AAMs, not at all effective for multirole operations PAF requires of all its aircraft.