I have used both Sunny Isle Jamaican Black Castor and Regular 100% Castor Oil (Cold Pressed). The Jamican Black Castor oil is much darker and much thicker then the regular version. The Regular "100%" Castor Oil is natural and has to be cold pressed in order to get the natural pale yellowish color.

Now here is an interesting fact about Jamican Black Castor Oil, it is not a completely "natural" product. In order to get that rich dark color, they add ash from roasted castor beans into the oil. So in truth, the dark color is achieved through ashes, and not because of being less processed vs the regular Castor Oil. Is there a benefit to the ash? Sunny Isle believes there is. In the end, it is up to you to decide.  Below are my reviews of both version of Castor Oil.

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Claims
100% Castor Oil (Cold Pressed & Cold Processed) is a cold pressed and cold processed, pure, natural emollient oil that softens and nourishes the skin. Castor Oil is ideal for use in castor oil packs and is excellent for massage into joints and muscles. Castor Oil is a natural emollient that penetrates the surface layers of the skin making it softer and more pliable.

Like
- It soften my locks
- Many uses (hot oil treatment, hair growth treatment, etc.)
- Simulate Hair Growth
- Washes Out
- All Natural
- Odorless

Dislike
- Thick (needs to be diluted)

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Claims
Jamican Black Castor Oil   has an age old reputation as an all purpose healing oil. It's commonly used for hair and scalp problems, skin conditions, aches and pain, laxative, breast massage, fibroid, first aid, for cuts and wounds, burns and much more.

Below is references about the ashes.
Organic seeds are roasted and ground by a manual Grinder and then the crushed beans are boiled to extract the 100% pure, dark brown, organic oil. It's the best quality oil on the market. Why you may ask? Compared to other brands it is the darkest Jamaican Black Castor Oil because we roast our beans longer which produces more Ash Content in our oil than any other oil on the market. More ash content increases the effectiveness of the oil. Therefore the Sunny Isle brand will strengthen and increase the length of your hair faster than any other brands on the market today.

Like
- It soften my locks
- Many uses (hot oil treatment, hair growth treatment)
- Simulate Hair Growth
- Washes Out
- All Natural (Sort of*)

Dislike
- Thick (needs to be diluted)
- Much Thicker then the regular castor oil
- Not Completely Natural Due to the Ashes (doesn't mean it's not good!)*
- Smoky odor

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Conclusion
I have used both version, and I can't tell the different as far as hair growth and uses, because they both do what I need it to do, and that is to soften my locks or to stimulate hair growth. Now the reason why I switch over to the regular cold pressed version was due to the smell of Jamaican Black Castor. You guys know how I'm about smells, and I had an issue with the smell of JBCO, which is smoky. I can't stand the smell of smoke, unless I'm at a BBQ, but my belly is about to be filled, so that doesn't count ^_-. I know they have scented ones now, but since I have tried the Regular Castor Oil, and find it to be just as good, plus it is odorless, I see no reason to change.

So do I recommend these products? Yes I do, but I would recommend the regular version over the JBCO, because it is not only cheaper, but also has no scent.