If the number code for "GREEN" is 49, then the difference between the number codes of "VIOLET" and "PINK" is:

Let's first check how "GREEN" is coded. Summing the individual alphabetical numerical positions ($A=1,B=2,\dots ,Z=26$):
$$\text{G}(7)+\text{R}(18)+\text{E}(5)+\text{E}(5)+\text{N}(14)=7+18+5+5+14=49$$

The code is simply the sum of the letters' numerical positions.

Now, let's find the value for "VIOLET":

$$\text{V}(22)+\text{I}(9)+\text{O}(15)+\text{J}(12)+\text{E}(5)+\text{T}(20)=22+9+15+12+5+20=83$$

Next, find the value for "PINK":

$$\text{P}(16)+\text{I}(9)+\text{N}(14)+\text{K}(11)=16+9+14+11=50$$

The difference between the codes of "VIOLET" and "PINK" is:

$$83-50=33$$