nope, 1.8 and 2.0 blocks are different, you won't get a 1.8 block (81mm bore) bored out to 2.0 (85mm bore) - in fact the GM pistons need more like 86mm.
Curiously if you look at the two blocks, one has "18" cast in the side, the other has "20"
As said though, if the 1.8 is from an escort, then you still need parts - Escort sump and pickup, water pump and pulley, possibly oil pump, alternator bracket..