If you liked the Detective Conan Movie 8: Magician of the Silver Sky anime, the Anime-Planet community thinks you'd like:
Fudou Academy's Hajime Kindaichi is the grandson of the famous detective Kousuke Kindaichi. Though he often appears to be lazy in school and clumsy, he is actually a modern-day genius with an IQ of 180. Together with his childhood friend Miyuki, Hajime solves the most unsolvable murder mysteries with ease and grace. From missing students to wax museums, there's no case that Hajime Kindaichi can't solve!
Kindaichi and Detective Conan Movie 8 have the same balance of mystery, deduction, and suspense. Both have lighthearted moments, but the focus is on solving darker schemes. Fans of one should enjoy the other.
Hajime Kindaichi, grandson of the famous detective Kousuke Kindaichi, travels with his childhood friend Miyuki to Uta Island for a special performance of The Phantom of the Opera. However, once they arrive, the actors begin to be murdered in mysterious ways; who better than Kindaichi to solve this unsolvable crime? With the Phantom himself as a suspect, Kindaichi will need to use his strongest wits to track down the murderer, before more lives are taken.
When there is a thief as infamous and cunning as Arsene Lupin the 3rd, copycats are inevitable – everyone wants to try their hand at becoming the master thief. The real Lupin has the target for his next job, Ice Cube – a diamond that holds a secret. However, whilst the presence of the copycats is of little consequence to the true Lupin, one impostor is becoming much more of a problem: he is after the same loot, and unlike the countless other fakes, this one is good. Now the real and the fake Lupins must battle it out to see who can get to the diamond first and who is most worthy of the Lupin name, all the whilst trying to avoid the relentless Zenigata who still vows to arrest Lupin – that is, if he can figure out which one is real!
Though treated in different ways, and not as prevalent in Conan, the aspect of an antagonist disguising himself as the protagonist is shown in both of these feature length anime. Also both Lupin III: Green vs. Red and Detective Conan: Magician of the Silver Sky place a heavy focus on the aspect of competition between the central characters. Throw in some over the top (and ludicrously far-fetched) action and interesting plot tiwsts, and I reckon that if you enjoyed one, you may like the other.