Nobody actually scales to Namek exploding tho, thread we just had aside, the namek bust was chain reaction tbf, Frieza did vape the core directly and tank the exploding but we dont know how big the core is and ISL go brrr which makes getting a value kinda tough.
Busting it flat-out wouldn't be 4-B anyway, it'd just be 4-C max. 4-C is a huge gap, even if Namek eclipsed suns, it'd still be kinda meh for a star overall and wouldn't reach even High 4-C.
If ya just mean the explosion itself, in manga it'd be 4-C if we use big namek, and toei, well yeah that shit is 4-B, actually, It'd be 4-A, Toei has a shot of Namek exploding and it takes out a chunk of the ******* galaxy iirc, Toei's explosion is dumb as shit either way with, or without.
Tbh I was thinking more range, Frieza has that whip attack that cut up the planet.
Ya draw two lines, compare. Literally it.