RY4 question

[sit.happens]

What is the difference between "50ml China E-Liquids" and "Custom China e-liquid".

I don't mean size wise. for example 50 ml RY4, 24mg comes in a white opaque bottle. Under the Custom China e-liquid you can order 60ml of RY4 at 24mg.

is there any difference flavor wise? Besides the fact that you can order the Custom China e-liquid in different sizes and strengths.

I was just curious why there are two different categories?

 

[lexi60]

The custom is china juice, just with no nic in it.
MadVapes adds the nic to it, They use VG nic, So it adds to vapor well.
It doesnt drop flavor much.