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There is a majro difference between these 2 engines. The fuel delivery is electronic on the 4HK1 vs mechanical ion the 4hE1. The 4HE1 engine is much older, too. It is pre EGR and was used in a lot of 1998 NPRs. The 4HK1 has a EGR system on the engine to meet 2004 EPA guidelines. You can;t easily swap one engine in place of the other.
What are you trying to do? Upgrade an engine? Replace an engine? I will forewarn that if you have the 4HE1 in a NPR as example. you will need to wire in the 4HK1 engine with the PCM, dash, fuel pumps, etc. It will be a lot of work. It isn't just a difference in HP and torque as the one above posted. That information is highly inaccurate. There is a whole lot more to the difference between these 2 engines.
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