In the field of biochemistry, this is virtually meaningless. A single substitution group is capable of producing wild changes in pharmacokinetics. The left and right-handed enantiomers of these molecules don't even act the same way in the body, and these aren't even positional isomers. The similarities with AMP and MAMP begin and end with being TAAR1 agonists. Off the top of my head, MAMP is also a potent agonist for sigma 1 & 2 receptors, and is generally more promiscuous.
Methamphetamine is a substituted amphetamine, not a "derivative". They're both simple substituted phenylethylamines, another TAAR1 agonist that is extremely prolific in your neurochemistry as we speak, and an incredibly diverse family of monoamines that range from lethal neurotoxin to serotonergic hallucinogen. The difference between the two is often as simple as a single atom moved 2 or 3 substitution points over. When you lack basic domain knowledge, please don't call other people dumb as you try (and fail) to correct them.