If you are just looking for "this look" or this effect on top, you can bring in a watercolor texture and use blending modes to get the right color and effect.
For example, you can use something similar to this stock image-
Image. or this
image, use the blending modes on a desaturated image(black and white image not Grayscale).
Then mask out the areas where ever you need the effect or do not need the effect.
If you manage to find a similar watercolor image ( or you might have to make your own) you can even just add Noise to the end to bring out the texture.