I've noticed that a few emojis on my phone are without colours and also like they're more simple in their design, compared to the rest. On the image below it's the phone emoji (number 5 from left) and the letter (number 3 from right). The bottom row is from my phone and the upper row is from Hangouts on my computer. All emojis except a few are the same.



Apart from the two mentioned above it also applies to the airplane emoji and maybe a few others I haven't noticed. The "problem" on my phone occurs no matter if I use Swiftkey or Google Keyboard. I've noticed it's exactly the same on my phone (Sony Xperia Z1 with CyanogenMod 11 / Android 4.4.4) and ny tablet (Nexus 7 with stock ROM / Android 5.1.1).

Is it the same on all Android devices? And does anyone know why?