Prog/Electro Big Room House Mix

TRACKLIST:

1) Armin Van Buuren & W&W – D# FAT (Original Mix)
2) Michael Woods, Starkillers, Dmitry KO & Amba Shepherd – Platinum Love Chains (Dmitry KO WMC 2013 Bootleg)
3) Hard Rock Sofa Vs. Zedd – Rasputin Clarity (R3hab Bootleg)
4) Dimitri Vegas & Like Mike – Wakanda (Original Mix)
5) Swedish House Mafia Vs. GTA, Henrix & Digital Lab - Hit It vs. Miami 2 Ibiza (French House Lovers Reboot)
6) Ivan Gough, Stevie Mink & Steve Bleas vs. Gregor Salto vs. Eric Prydz - Boom! Azumba Every Day (ELEMENT 45 Reboot)
7) Henrix Feat. Roland Clark - Rock This Dream (Original Mix)
8) Uberjakd feat. Sarah Bodle - Noises (Leventina Remix)
9) Bruno Mars - When I Was Your Man (Filtercrush Remix)
10) Rihanna – Stay (Filtercrush Remix)
11) Dimitri Vegas, Moguai & Like Mike – Mammoth (Original Mix)
12) Axwell vs Supermode vs One Republic - Why I Lose My Disposition (Matt Birrell Mashup)

Any critique?

Hi there. I really enjoyed listening to this mix. The transitions were very well executed. The last transition was not as smooth as the rest though. Then again, key changes are very noticeable. I'm rather new to DJ-ing, and I thought I'd ask: how would you mix 2 songs with different keys?

Thank you, and the same way as you would mix any two songs that have the same key.