Both are about Deity-like figures who fall in love with the reincarnation of their former lovers. In Destiny's Love the deity-figure is part of an organization who governs Earth while in King of Blaze the deity-figure is more of a refugee from another planet. Yes, both "deities" are actually aliens.
Both have an alien male protagonist in love with the reincarnation of a past lover. Both modern fantasy romances. The Love Knot is has a little more tragic ending but both still executed this type of genre pretty decently.
Similarly has reincarnations of deities and mortals. One immortal remained alive for thousands of years .
Not sure why they decided to change actresses in Ice Fantasy Destiny tho. With the original actress only making a cameo appearance towards the end.