mgmidget

hi peeps this is my first post lol
been given a 04 plate focus, i currently drive a rover 75,which is by the way litteraly falling to bits. The focus had a blacktop 1.6 zetec in it, now in my back garden lol, big end kaput, had difficultys removing it lol namely manifold bolts plenty of bashed fingers lol changed gearbox driveshaft oil seals got clutch and slave ready to put in,trying to source a decent engine seen a few silvertops goin, whats the difference between black top and silver tops will they run on same ecu? thanks