Want to replace hot end (e3d?)

I have had my SD4 for several months, and I have finally borked my hot end (I think).  Some filament broke inside and by the time I caught it and was able to stop the print, I ended up with a nasty hot clog in the nozzle.  Even drilling it out didn't help.  As a last resort, I tried getting the nozzle hot and pushing through, but no luck.  Furthermore, as I took the hot end apart, I noticed that the insulation going to the heating block has basically disintegrated.

I *could* try to take everything apart, and get a new nozzle, or even replace the entire hot end with a factory replacement, but I have been thinking about going to an e2d mk6 anyway.  I see that several other people have done this with their SD4.  I am not quite sure of how doing this will be different from the instructions for the SD3, though.  I can't find much documentation of what has changed.

Can I still just switch out the power supply, or are there other parts that now need to be replaced?  I assume that there is no wiring on the current SD4 that can't handle the extra power if it gets drawn, but I am not 100% sure about that.

Mine has the new hot end and aluminum extruder block.  Is the carriage the same between the SD3 and SD4 so that I can just have someone print a modified lawsy mk5 extruder for me and use this with the e3d mk6? 

Is there anything that is different about the firmware update?

Anyway, if you have done this mod, I would appreciate some advice.

James