Well well...
Comparing minimum required approach-climb and landing-climb performance of 2- and 4-engine airplanes with one engine out (thus 25% less thrust on a 146, but 50% on a 737) might require some additional considerations
According FAR 25 both airplanes need to demonstrate the SAME (3.2%) landing climb segment gradient (=balked landing), whereas on a missed approach, a 4-engine a/c should indeed have a better climb gradient (2.7% vs. 2.1%).
This means, that when catering for an engine failure during balked landing, procedure designers (and finally pilots) are faced with the same performance, regardless of the number of engines we have. During approach climb (missed approach) however, 4-engined a/c are about 28% better off.