not sure if there supposed to be the same,according to ngk they have different plugs 
bkr5egp is for 1.6k
denso ik16 is for 4.6k
ik16 isnt avaliable,ik20 is,they have same application,just that ik16 is 5 hear range n ik20 is 6 heat range
6 heat range being better
though leme recheck if bcp6eix fits
denso ik20 wil l be better as the bkr5egp is platinum n ik20 is iridium 