I think the two are quite different. Both are truly excellent hashes, and both have that clean buzz you get with good clean hashes. I would suggest that the King Hassan is gives a lite more 'mong' for me, and this one seems like a slightly higher buzz. For me, I've not needed to heat this to use, but the Hassan takes just a little flame to use and feels slightly oilier. It's like comparing two shiny diamonds though, if you like hash you'll love em both. I only got 7 of this and 7 of the hassan, but I'm coming back for another 14 of this, and I'm sure I'll get more hassan sometime soon. Can also recommend the critical drysift hash if you haven't tried... very different from these two hashed with a buzz I find more towards grassy buzz.
Me and wife been doing this daily for 35 years. In all that time I've seldom gotten hash as good as this and can recommend them all to anyone who appreciates quality. Happy chuff chuff chuffed!