75 Pa. C.S. § 1586
The department shall, for purposes of imposing a suspension or revocation under Article IV of the compact, treat reports of convictions received from party states that relate to driving, operating or being in actual physical control of a vehicle while impaired by or under the influence of alcohol, intoxicating liquor, drugs, narcotics, controlled substances or other impairing or intoxicating substance as being substantially similar to section 3802 (relating to driving under influence of alcohol or controlled substance). The fact that the offense reported to the department by a party state may require a different degree of impairment of a person's ability to operate, drive or control a vehicle than that required to support a conviction for a violation of section 3802 shall not be a basis for determining that the party state's offense is not substantially similar to section 3802 for purposes of Article IV of the compact.
75 Pa.C.S. § 1586