Theocracy and absolute monarchy are not similar. Let's break down what each one is first.
Here are some of the key ideas from both.
Absolute Monarchy
Country is ruled by a king or queen
Rule is inherited and passed down
The ruler clains divine right (God's mandate that the ruler was chosen by God and is not subject to any earthly authority)
The ruler has total control
Theocracy
Country is ruled by a one or a few people with religious authority
The rule is based upon a particular religion
The ruler is spiritual and is in charge of the government and the leads the spirituality of its people
All laws are religious in nature