They are essentially the same engine, and have identical horsepower and torque ratings 230hp/340ft lbs. Same bore and stroke - pretty much all the same as far as the short block goes so they should have the same longevity. Most polys had solid lifters so they have a bit more maintenance. Some parts from the LA series of engines will work on the A318 as well. I've found quite a few articles on hot rodding an A318 - it's an interesting engine for sure.
