Let's take a step back here for a second.
 
To confirm, yes, the GQ power supplies and the GP (or G1+) power supplies do not share the same pinouts on all cables.  Most relevant in this case, of course, is that the SATA power pinout is different between the two sets of power supplies.  Plugging the SATA cable from one series into the other series will likely kill anything plugged into the SATA connectors.
 
The issue here, and I'm being fair, is that an assumption was made about how power supplies and modular cables work together and, unfortunately, it turns out that the assumption was wrong.  I could point out, as others have, that the OP could have contacted Customer Service, read the manual more closely, or done any other number of things that would have suggested some degree of caution for using modular cables on a different model power supply, but I won't belabor the point.  The OP owned up that a mistake was made, and we are all aware of what happened now.  However, we have all made similar mistakes in the past due to a wrong assumption (except for maybe 3 or 4 people), so it's painful, but we can all relate to an extent.
 
@eddiewan, I do appreciate that you want to make sure that we are doing what we can to prevent issues like this from happening to other customers.  One thing to keep in mind is that the GQ power supplies have been around for quite some time.  There probably won't be many changes left, if any, for that series before its time is done.  That's not to say, however, that there are no safeguards or checks in place to prevent this sort of issue from happening.
 
Generally, when this issue has occurred in the past, it's due to one of our staff sending the wrong cable when an end-user requests the cable.  When the user tries out the new cable, a similar issue to yours would occur.  This happened a number of times over a handful of months several years ago, so we did a couple things to fix it.  One of those things was to train our staff better and do a better job of organizing how the request was processed from start to finish.  Another thing we did was to begin manufacturing the cables to print the PSU series name on the ends of the connectors to make it clear which cables belong to which power supply.  After taking these steps, those sorts of problems have become virtually non-existent.  However, I cannot honestly recall the opposite issue where customers simply swap power supplies and run into this problem.  I'm sure it's happened before, and I'm sure it also happens sometimes when people change brands of power supplies, but it's a rare occurrence.
 
One other major change, which is more recent, is that we've started manufacturing all new fully-modular and semi-modular power supply series with the same pinouts, regardless of the OEM.  For example, both the G1+ and PQ power supplies share the same pinouts as the B3, G2, G3, P2, T2, etc. power supplies.  This was mostly done to have consistency for both end users and to make sure that customers that also purchase our individually sleeved cables can continue to use them if they upgrade or change to a new model.  So, we have made changes to minimize the possibility of this occurring in the future.
 
I understand that this doesn't help you now, but I also want you to understand that we do look at issues like these as an opportunity to review whether we can improve or prevent a situation for our customers.
 
*Edited to clarify that new power supply series, and not simply new power supplies, will share the same pinouts going forward.