You'll be fine lol. Either it won't work or it will. I've personally hated all Kanger tanks and use an Aspire Nautilus as my go-to tank, so I'm not familiar enough to know for sure if they'll work or not. But regardless though, I guarantee 100% you won't be doing anything damaging in anyway by trying an Evod coil in your Aerotank Mega (just as long as you don't try anything like forcing it in if it's not the right size or doesn't fit).
Kanger does have a history of making coils very similar (part of the reason I hate Kanger tanks) as well as backwards compatible for various models and types. I also know for a fact you can use the same Atomizer head for the Protank 3, Aerotank, EVOD2, T3D, EVOD Glass and Mini Protank 3, but since they've apparently made some changes to the coils for the Mega Aero I'm not 100% sure. Hopefully they will though
What you can do to easily see though is first take apart your Mega Aero Tank. Don't fill your tank with liquid or anything yet and simply screw in an Evod coil into your Mega Aero's bottom piece (assuming that it fits of course) and just attach that bottom part directly to your battery. Fire the button and just look down into the Evod coil, if it starts lighting up and glowing red then your good. If you're still unsure, hold button down for a few seconds and if it's working you'll feel the coil getting hot. That way you don't waste any juice or risk spilling anything. Hope this helps!