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There are more examples, but they are of the same type (etymologically unrelated, as Thorsten Dittmar explained for fehlen/empfehlen): (zurück)weichen (ich wich (zurück)) vs. einweichen (ich weichte ein) (er)ringen (ich (er)rang) vs. beringen (ich beringte) (er)schallen (es (er)scholl) vs. beschallen (ich beschallte) There are also verbs that follow ...

fehlen and empfehlen do not derive from the same base (fehlen). The verb fehlen derives from the old form vælen or vēlen, which means to miss (a target). Empfehlen on the other hand derives from the verb fel(a)han, which means to sow or to entrust. finden and empfinden do derive from finden, that's why they share the same conjugation.