No, it's not. Please stop spreading this age-old myth*. You can literally buy prescription meth in a bottle, and it's called Desoxyn.
Adderall is extremely similar, because amphetamine is quite similar to meth (just an inferior version IME). D-meth is probably 20-30% more potent than d-amp dose for dose, but with somewhat reduced unwanted peripheral (body) side effects. The other main differences are meth releases some serotonin (not nearly as much as MDMA) while amp releases almost none, and that for whatever reason methamphetamine takes 3-3.5 hours to reach peak blood concentration when taken orally, whereas amphetamine peaks much sooner.
* I get it, the point isn't literally that it's meth, just that it's similar. But it's silly thing to say rhetorically when you can literally get prescription d-methamphetamine in the US under the brand name Desoxyn.