Old 30b/20b firmware POGO cable for HP15c CE?

[JimP]

Hi all,
I've looked through the various threads but couldn't find the answer to this question (apologies if it HAS been answered before!). I've seen it answered the other way round - you can't use the new cable on older models without doing some trickery. So here goes:
I have one of those older firmware flashing cables that has a USB on one end and an RS-232-like serial cable adapter in the middle, with a SAM-BA / POGO port on the other end. It was made back in the early days of flashing HP20b and HP30b calculators to turn them into WP34s and WP31s calculators (I have one of the former).
Can this same older cable be used to upgrade firmware etc. on the new HP15C Collectors Edition model? Or will the power be all wrong and destroy it? In other words do I have to buy a fresh cable?
Thanks for your help!