They're two completely different heads, despite the fact that they may look the same.

The Montec is made using an injection molding process, which basically from my understanding takes a powdered metal and through a bonding and heating process hardens it into one solid piece.

The HellRazor is also a 100% stainless steel broadhead,however itis photon welded, the same process used on it's bigger brothers better known as the Razorcaps. The blades are .040" thick, which I believe is thicker than that of the Montec, which from what I have gathered has .010" thick blades which seems awful thin to me. Anyone know if that's right??

Any and every short 3 blade cut-on-contact resharpenable broadhead is going to look similar - there's no way for them not to. Change the cutouts, the color, or the shape of the ferrule but you're still going to end up with a broad that looks pretty dang close to the rest of them.