What do you have against the MJE340? Is it too large? Is it too much more money (onesies retail in Silicon Valley is 34 cents versus 75 cents)? If I had to go out and buy new parts in hobby quantities, I would get the MJE340 and not invest any more brain power, but if it was going to be used in quantities of thousands I would choose more deliberately. If I already had some MPS-A42's on hand, I would wire it in to the circuit and test to see how hot it gets, and switch to the MJE340 if it got noticeably warm. Oor you could do the Spice modeling and formal thermal analysis. Actually, it would not surprise me if you opened them up and found that they used the same chip and differed only in the massiveness of the packages.
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