(CW: American #analysis re: British politics, was written on my phone so probably a lack of proper sentence structure, kind of reads as a cheap Al impersonation - really just a terrible post all around)
Pretty much just a superficial (and non-serious) comparison based on Smith's progression from Pfizer executive to Left MP. That being said, the situation is pretty different considering that Smith was "lefty" Before It Was Cool* while Murphy's progression to wannabe progressive firebrand is probably just in response to national trends, considering that he's still very much a New Jersey machine candidate and probably shouldn't be trusted. I'll still try to be optimistic about Murphy and hope he isn't just putting on a show, though.
*Not entirely accurate, and it'd be hard to argue that Smith is on the spectrum of what currently constitutes "Labour Left", but Smith IIRC played the Soft Left role during Miliband's tenure while other prospective leadership hopefuls/Low Energy Losers like Umunna still thought they could win a leadership election on the backs of Progress activists etc.
Damn even when someone is running the exact campaign to bring people like you on, you still sh**t on him for it.