Are the Buick & Ecotecs the same bottom end?

[-=$natch=-]

As the title states, are the buick & ecotec the same engine other than the injection and bolt ons?

As I'm looking for an engine to rebuild to put in my series II VR and seem to see heaps of VS/VT Ecotecs around but not many VP/VR engines.

Also, is there anywhere that sells new alloy rocker covers for the buicks?

Thanks

[delcowizzid]

different blocks the head surface is an inch lower on ecotech

[-=$natch=-]

Ok thanks for that.