I dont know the answer to that but its entirely possible that it will work. I would suggest that you do the following:
Follow my instructions to flash the controllers in the E-Class to channel SKU firmware then get the unit totally up to date with the latest firmware.
Shut everything off, plug in the J-Class unit and see if everything boots. If it does boot, re-apply the latest firmware to the E-Class now that the J-Class has been plugged in. Note that failing to re-apply the firmware after the J-Class has been plugged in will result in the SAS expanders in the J-Class NOT being upgraded to the latest firmware.