Ej8 = Coupe Vti - D16y8 vtec
Ek1 = hatch back - d16y4
Eg5 - hatch back d16y1 vtec

Its obvious the last owner has done something here, check ur rego to the engine code an vin to be sure that its a legit swap
things is any d-series is a direct drop in, without changing the mounts, unlike goin from d to b-series

Im not sure as to electrical problem though

if the ek1's did come with abs, than that would mean those with abs drums can swap the ek1's abs disc brakes instead of using ek4's/em1's correct?