There are 3 versions of Logitech G502.
The initial Core version had only single color backlight.
Then Spectrum version with RGB was launched. Both these versions have PWM3366 sensor, which is considered one of the best sensors.
Latest version of G502 has Logitech's own Hero sensor. It's just as good as PWM3366 in terms of performance but has the advantage of lower power consumption. But that is of significance only in wireless mice so practically they are same in terms of performance.
Amongst the links you have shared, only PC Fanatics has the newest Hero version. You can get that from Czone as well for slightly lower price.
https://czone.com.pk/mouse-logitech-logitech-g502-hero-high-performance-gaming-mouse-910-005472-pakistan-p.7372.aspx
Personally, I'm not a fan of G502's shape and prefer G403 and Razer Deathadder shapes over it. But that's just a personal preference and you may like it more than G403 shape.
