will a 1986 1.8 fit into a1990 2.0

I have a 1990 pontiac sunbird. It has a 2.0 liter 4 cylinder. I have found a 1986 pontiac sunbird with a 1.9 liter 4 cylinder. Both motors look the same. Is the 2.0 liter the same block as the 1.8 liter? Please let me know if this will work. Thank You Doug