Is the z30 just a 20% bigger z10?

I was looking at the phones, and the z10 has a screen size of 4.2 " while the z30 has a screen size of 5 ".

So I did some calculations, and it seems the z30 is just a 20 % bigger z10.

Coincidentally 10 + 20 is equal to 30, so z10 + 20 is z30.

If you take 4.2" z10 and multiply it by 0.20 (20%) you get 0.84".

If you add 0.84" to 4.2" you get 5.04" which is the screen size of the z30.

So what do you think is this a coincidence or was the z30 named in proportion to the 20% increase in screen size to the z10?

(Although being an engineer, im a firm believer that when it comes to mathematics there are no coincidences.)

Not trolling, just genuinely intrigued.

I love the z10, q10 and have not tried the z30 yet.

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