bro perdana....
we know perdana knuckkle is PCD114...but 4lugs....
as u said....eterna got 5lugs ma....
but wat is its PCD???
5lugs oso got PCD100 and PCD114 ma.....
as for the engine conversion...
yeah...
can b done....
just find one workshop to swap la....
as for the inspection part.....
guess its a bit blur la.....
perhaps both cars hav to go at the same time....
coz in order for u to register his engine number....
hav to prove that his engine edi out of his car...
n he edi andorse wif another engine....
vice versa.....
guess u should go ask at JPJ/Puspakom to re-confirm la.....